Retromod compatibility reports

[_Mod__MiniaTuria_1.12.2__v8.4_.jar.txt](https://github.com/user-attachments/files/31070273/_Mod__MiniaTuria_1.12.2__v8.4_.jar.txt) [cocricotMOD_1.12.2_v1.11.0.jar.txt](https://github.com/user-attachments/files/31070271/cocricotMOD_1.12.2_v1.11.0.jar.txt) [rojiuramod-1.12.2_0.1.4.a.jar.txt](https://github.com/user-attachments/files/31070272/rojiuramod-1.12.2_0.1.4.a.jar.txt)

Logs says that the mods crashed at the minecraft launch

Hit play and the launcher couldn't complete "preparing" status before it crash, game never launched

CraftStudio API (craftstudioapi) has failed to load correctly java.lang.NoClassDefFoundError net/minecraftforge/fml/common/network/NetworkRegistry. Animania (animania) has failed to load correctly java.lang.NoClassDefFoundError: net/minecraft/command/ICommand

The #114 report: the mod's entrypoint died on 26.x API breaks (ConditionalEffect.codec, the deleted loot-type wrappers) before its custom types registered, so its internal datapack looked broken. Also needed entity-predicate key namespacing in the JSON migrator and two new intermediary mappings. Verified on a 26.2 dedicated server: all aer:* types register and the datapack loads with zero errors. Individual enchantment effects not play-tested one by one.

Crash is attributable to Chunky - NoSuchMethodError on TicketType.create(String, Comparator), the 1.18-era chunk-ticket API that 26.1 reworked. AppleSkin alone was not isolated in this run, which is exactly what bundle reports are for. See the single-mod Chunky entry.

snapshot.3 fixed the Retromod-caused failure (the model bridge was rewriting its mixin handler descriptors, #70). What remains is the mod's own jar-in-jar reach-entity-attributes 2.4.0, whose 1.20.1-era mixins target methods that changed by 1.21.11 (multiple critical injection failures). Needs the mixin-handler re-typing work tracked for a later release, or a 1.21.x build of the mod.

Does not start

AsyncParticles is coremod-class - it wraps the Mixin service itself and generates conditional mixins at load time. On 1.21.11 its own machinery cancels most of its mixins, and its core @Overwrite targets a ParticleEngine method whose signature changed, so it cannot apply. An @Overwrite body is the replacement code itself; no redirect can rewrite it for a changed method. Listed on Mods That Can't Be Translated. (#63)

Paintings are registered and can be placed (both the specific painting from the creative inventory and from the random painting item), no errors in the log and no missing classes/methods/etc. Side note: This was transformed with the Retromod CLI. verification report: [_neoforge-1.21.4_paintings_pack.jar.txt](https://github.com/user-attachments/files/29424133/_neoforge-1.21.4_paintings_pack.jar.txt)

A VerifyError in Retromod's reload-listener bridge, caused by its own Gson relocation, fixed in 1.3.2. NexusLib's particle renderer implements ParticleRenderType, now a final record, and Bountiful Fares mixes into the removed boat types, so both need a port.

it appears in the mods as if it was working, but ingame doesn't works at all. you also can't access to the configuration of the mod, so basically it's like a ghost mod, you can see it but can't do nothing with it

Borked [cartaddon-0.8.04.jar.txt](https://github.com/user-attachments/files/29478865/cartaddon-0.8.04.jar.txt) Note: also tested with mine mine no mi being 1.20.1 (Crash still happens)

java.lang.RuntimeException: Could not execute entrypoint stage 'client' due to errors, provided by 'chatbubbles' at 'com.mamiyaotaru.chatbubbles.fabricmod.FabricModChatBubbles'! at net.fabricmc.loader.impl.FabricLoaderImpl.lambda$invokeEntrypoints$0(FabricLoaderImpl.java:413) at net.fabricmc.loader.impl.util.ExceptionUtil.gatherExceptions(ExceptionUtil.java:33) at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:411) at net.fabricmc.loader.impl.game.minecraft.Hooks.startClient(Hooks.java:53) at knot//net.minecraft.client.Minecraft.<init>(Minecraft.java:456) at knot//net.minecraft.client.main.Main.main(Main.java:278) at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:514) at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:72) at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23) at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) at java.base/java.lang.reflect.Method.invoke(Method.java:565) at com.modrinth.theseus.MinecraftLaunch.relaunch(MinecraftLaunch.java:61) at com.modrinth.theseus.MinecraftLaunch.main(MinecraftLaunch.java:28) Caused by: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/event/client/ClientTickCallback at java.base/java.lang.ClassLoader.defineClass1(Native Method) at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:962) at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:144) at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.defineClassFwd(KnotClassLoader.java:165) at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:368) at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:231) at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:119) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:490) at java.base/java.lang.Class.forName0(Native Method) at java.base/java.lang.Class.forName(Class.java:547) at net.fabricmc.loader.impl.util.DefaultLanguageAdapter.create(DefaultLanguageAdapter.java:53) at net.fabricmc.loader.impl.entrypoint.EntrypointStorage$NewEntry.getOrCreate(EntrypointStorage.java:124) at net.fabricmc.loader.impl.entrypoint.EntrypointContainerImpl.getEntrypoint(EntrypointContainerImpl.java:53) at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:409) ... 10 more Caused by: java.lang.ClassNotFoundException: net.fabricmc.fabric.api.event.client.ClientTickCallback at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:580) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:490) at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:239) at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:119) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:490) ... 24 more Will provide the log soon, as it seems it's too big to be put into "Details".

NoSuchMethodError in the server tick loop: TicketType.create(String, Comparator). 26.1 reworked TicketType, and Chunky creates its chunk-loading ticket with the old 1.18 signature. Needs a TicketType bridge in Retromod (tracked) or a current Chunky build.

https://modrinth.com/mod/cooking-for-blockheads

Will provide the log soon, as it seems it's too big to be put into "Details".

The transform itself completes (metadata patched, bridges embedded), but the first boot with the transformed jar terminates the JVM right after the mod list prints, with no exception, crash report, or hs_err. Under investigation, the silent-death signature doesn't match any known Retromod failure mode yet.

Crashed at construct time on snapshot.2 and earlier (NoClassDefFoundError: RecipesUpdatedEvent , the event was renamed in the 1.21.4 line). Fixed by a class redirect in snapshot.3; the listener only re-triggers EMI's own reload, so the rename is all it needed.

Needed the FabricItemGroupBuilder overload fix (#57) and the pre-1.21.2 InteractionResult field-descriptor bridge. Mobs and items are present; pre-1.17 custom model rendering depends on the model bridge and may show visual gaps.

Crashes on launch, won't even load.

Will provide the log soon, as it seems it's too big to be put into "Details".

NoClassDefFoundError: RecordItem, which Minecraft removed at 1.21. Retromod only rebased that class from 26.1; 1.3.2 rebases it on every host that removed it. Not retested on 1.3.2.

-The game immediately sends you to the Error Loading Mods page. [crashlogfarmersdelight.txt](https://github.com/user-attachments/files/30362417/crashlogfarmersdelight.txt)

doesn't load

NoClassDefFoundError: IConfigSpec. This is a Forge mod on NeoForge, and the Forge to NeoForge bridge does not carry Forge's config-spec types yet.

The pre-1.19.3 CreativeModeTab(String) constructor, the same gap as Pyrologer And Friends: the creative tab bridge does not work on a Forge host that runs SRG names.

As reported. /head player looks profiles up through authlib classes 26.3 renamed, which 1.3.2 carries, and through two methods that gained a Prediction parameter, which are not bridged yet.

NoClassDefFoundError: net/minecraft/client/renderer/MultiBufferSource while constructing the mod. Retromod ships a 26.2 stand-in for that class, so why it did not apply to this 26.1-built mod is still open.

RuntimeException: Errors occurred while remapping NeoForge mods! <html>at knot//xyz.bluspring.kilt.loader.KiltLoader.createModContainers(KiltLoader.kt:619)<br>at knot//xyz.bluspring.knit.loader.KnitLoader.scanMods(KnitLoader.kt:173)<br>at knot//xyz.bluspring.knit.loader.fabric.KnitEarlierInitializer$onLanguageAdapterLaunch$1.invokeSuspend(KnitEarlierInitializer.kt:16)<br>at knot//kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:34)<br>at knot//kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:100)<br>at knot//kotlinx.coroutines.internal.LimitedDispatcher$Worker.run(LimitedDispatcher.kt:124)<br>at knot//kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:89)<br>at knot//kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:586)<br>at knot//kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:798)<br>at knot//kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:717)<br>at knot//kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:704)</html> NoSuchMethodError: 'int com.retromod.polyfill.fabric.embedded.TinyVisitor$TinyMetadata.index(java.lang.String)' <html>at knot//net.fabricmc.mapping.tree.TinyMappingFactory$Visitor.start(TinyMappingFactory.java:218)<br>at knot//net.fabricmc.mapping.reader.v2.TinyV2Factory.visit(TinyV2Factory.java:59)<br>at knot//net.fabricmc.mapping.tree.TinyMappingFactory.load(TinyMappingFactory.java:71)<br>at knot//net.fabricmc.mapping.tree.TinyMappingFactory.load(TinyMappingFactory.java:57)<br>at knot//xyz.bluspring.kilt.loader.remap.KiltRemapper.&lt;clinit&gt;(KiltRemapper.kt:116)<br>at knot//xyz.bluspring.kilt.loader.KiltLoader.createModContainers(KiltLoader.kt:616)<br>... 10 more</html>

The reported JAR reaches resource and sound loading. A live regression reads the current mob-griefing rule. One legacy item model still fails to parse, and villager behavior still needs a longer gameplay test.

This mod transforms nearly perfectly, with the only issue being a Retromod built-in class, which doesn't affect any functionality [(Verification report)](https://github.com/user-attachments/files/30105161/Luminous_Wool.txt). Minecraft loads with the transformed mod and can load into a world. The blocks are registered and can be crafted; luminating the blocks with glow ink sacs (and the advancement "Glowpunk") also works. They also luminate light from themselves, which is the point of this mod. <img width="1920" height="1080" alt="Image" src="https://github.com/user-attachments/assets/efbcc15d-179c-4a27-96bc-a2e9a5615471" />

Forge 26.2 (Forge 65.x) replaced EventBus 6 with EventBus 7, which used to kill every old Forge mod at construction. The snapshot.7 LegacyEventBus bridge maps the old idiom (getModEventBus, DeferredRegister.register(bus), MinecraftForge.EVENT_BUS, @SubscribeEvent, EventPriority) onto BusGroup, and as of snapshot.7 the lambda setup listeners (addListener(this::...)) bind too. Verified in-game to the main menu with content registered; in-world testing was done on the NeoForge host (see the other entry), and the in-world fixes are loader-shared.

The snapshot.7 acceptance mod for the Forge-to-NeoForge migration spine. Needed (and drove) a chain of fixes: the FMLJavaModLoadingContext bridge, the registry-id thread-local, the 26.2 ColorCollection accessors, the 1.21.4+ client item definitions (all items rendered as the missing-texture checkerboard before), and the removed is() overloads (placing a bridge crashed the server tick loop before). Verified in-game: creative tabs are fully textured, bridges place, and the world persists across rejoin. Gold rather than diamond only because not every block variant was individually play-tested.

The snapshot.7 acceptance set. All three scan, construct, register their blocks and items, reload resources, and reach the main menu with fully textured creative tabs. In-world placement was verified in depth on Bridges (see its single-mod entry); Roofs and Trapdoors got registration and creative-tab verification.

Following instructions on Github, posting the report for this mod. If I did something wrong, I'll gladly be corrected. [Metallurgy-4-Reforged-1.4.1.jar.txt](https://github.com/user-attachments/files/29360773/Metallurgy-4-Reforged-1.4.1.jar.txt)

[04:30:27] [Render thread/INFO]: [STDERR]: [Render thread] INFO retromod - AOT compiling [2/3]: minecolonies-1.1.1330-1.21.1-snapshot-original-retromod.jar [04:30:27] [Render thread/INFO]: [STDERR]: [Render thread] INFO retromod-aot - AOT compiling: minecolonies-1.1.1330-1.21.1-snapshot-original-retromod.jar [04:30:27] [Render thread/INFO]: [STDERR]: [Render thread] INFO retromod-aot - Created backup: mods\retromod-backups\minecolonies-1.1.1330-1.21.1-snapshot-original-retromod.jar [04:30:28] [Render thread/INFO]: [STDERR]: [Render thread] WARN retromod-aot - Hybrid compilation failed for com/minecolonies/api/util/MessageUtils$MessageBuilder, using simple transform [04:30:28] [Render thread/INFO]: [STDERR]: [Render thread] ERROR retromod-aot - AOT compilation failed: minecolonies-1.1.1330-1.21.1-snapshot-original-retromod.jar [04:30:28] [Render thread/INFO]: [STDERR]: java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0 [04:30:28] [Render thread/INFO]: [STDERR]: at org.objectweb.asm.Frame.merge(Frame.java:1281) [04:30:28] [Render thread/INFO]: [STDERR]: at org.objectweb.asm.Frame.merge(Frame.java:1256) [04:30:28] [Render thread/INFO]: [STDERR]: at org.objectweb.asm.MethodWriter.computeAllFrames(MethodWriter.java:1612) [04:30:28] [Render thread/INFO]: [STDERR]: at org.objectweb.asm.MethodWriter.visitMaxs(MethodWriter.java:1548) [04:30:28] [Render thread/INFO]: [STDERR]: at org.objectweb.asm.MethodVisitor.visitMaxs(MethodVisitor.java:787) [04:30:28] [Render thread/INFO]: [STDERR]: at org.objectweb.asm.ClassReader.readCode(ClassReader.java:2664) [04:30:28] [Render thread/INFO]: [STDERR]: at org.objectweb.asm.ClassReader.readMethod(ClassReader.java:1512) [04:30:28] [Render thread/INFO]: [STDERR]: at org.objectweb.asm.ClassReader.accept(ClassReader.java:745) [04:30:28] [Render thread/INFO]: [STDERR]: at org.objectweb.asm.ClassReader.accept(ClassReader.java:425) [04:30:28] [Render thread/INFO]: [STDERR]: at knot//com.retromod.aot.AotCompiler.transformClassSimple(AotCompiler.java:475) [04:30:28] [Render thread/INFO]: [STDERR]: at knot//com.retromod.aot.AotCompiler.transformClassAot(AotCompiler.java:462) [04:30:28] [Render thread/INFO]: [STDERR]: at knot//com.retromod.aot.AotCompiler.compileJar(AotCompiler.java:280) [04:30:28] [Render thread/INFO]: [STDERR]: at knot//com.retromod.aot.AotCompiler.compileModAot(AotCompiler.java:142) [04:30:28] [Render thread/INFO]: [STDERR]: at knot//com.retromod.aot.AotCompiler.compileAllModsSync(AotCompiler.java:221) [04:30:28] [Render thread/INFO]: [STDERR]: at knot//com.retromod.core.Retromod.performAotCompilation(Retromod.java:430) [04:30:28] [Render thread/INFO]: [STDERR]: at knot//com.retromod.core.Retromod.onInitialize(Retromod.java:240) [04:30:28] [Render thread/INFO]: [STDERR]: at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:409) [04:30:28] [Render thread/INFO]: [STDERR]: at net.fabricmc.loader.impl.game.minecraft.Hooks.startClient(Hooks.java:52) [04:30:28] [Render thread/INFO]: [STDERR]: at knot//net.minecraft.client.Minecraft.<init>(Minecraft.java:456) [04:30:28] [Render thread/INFO]: [STDERR]: at knot//net.minecraft.client.main.Main.main(Main.java:278) [04:30:28] [Render thread/INFO]: [STDERR]: at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:514) [04:30:28] [Render thread/INFO]: [STDERR]: at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:72) [04:30:28] [Render thread/INFO]: [STDERR]: at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23) [04:30:28] [Render thread/INFO]: [STDERR]: at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) [04:30:28] [Render thread/INFO]: [STDERR]: at java.base/java.lang.reflect.Method.invoke(Method.java:565) [04:30:28] [Render thread/INFO]: [STDERR]: at com.modrinth.theseus.MinecraftLaunch.relaunch(MinecraftLaunch.java:61) [04:30:28] [Render thread/INFO]: [STDERR]: at com.modrinth.theseus.MinecraftLaunch.main(MinecraftLaunch.java:28) Will provide the log soon, as it seems it's too big to be put into "Details".

Invalid descriptor on its ItemEntity merge mixin: 26.2 changed that method's parameters and return type, which the automatic mixin repair declines. The retromod/stripped warnings in the log are mixins Retromod disabled on purpose.

IncompatibleClassChangeError in Retromod's creative tab bridge, fixed in 1.3.2. The bridge's Mojang member names then fail on a Forge 1.20.1 host, and the mod also uses Item.Properties.tab and Material, which are not bridged.

The reported JAR reaches resource and sound loading. A live regression toggles and restores the cached random-tick state for ice. Snow and ice behavior still needs a longer world gameplay test.

doesn't appear in game

It registers through DeferredRegister.createBlocks, whose typed register overload Retromod's registry-id bridge did not match. Fixed in 1.3.2, and the mod loads on NeoForge 26.1.2 in testing.

I can join a world with it now (unlike back in 1.3.1 with #285). The blocks register as well now, they are also craftable with their defined recipes and placeable like usual.

I can join a world with it, and the blocks register, are craftable and placeable. I haven't found any graphical artifacts neither with the OpenGL nor with the Vulkan renderer. The doors duplicate whenever I break them unlike 26.1.2, and is the reason why I am only giving it a gold rating instead of diamond for the 26.1.2 retest in #314. Retromod 1.3.3 converts the mod's loot conditions to 26.3's format, which fixes the door duplication, so this entry is diamond.

Footwork api and attributizer are required for project war dance which is the only reason I had them in here. It said that wardance and footwork api were for older versions of neoforge or for minecraft forge and cannot be loaded. I expected attributizer to have an issue as it allows you to modify default item attributes using datapacks, its error was that it "needs language provider javafml:47 or above to load". I can't remember what the issue with the war dance beta from the discord server was but it wasn't the same. If you could it would be epic if you could go and try to find some way to fix that one as well? Maybe you could ask the war dance dev to make a change or two to their mod to make it more possible? Thank you.

NoSuchMethodError on the pre-1.19.3 CreativeModeTab(String) constructor. Retromod's creative tab bridge uses Mojang member names, which a Forge 1.20.1 host does not run, so it does not help here yet. The author has since published a native 1.20.1 build.

It requires Farmer's Delight 1.20.1-1.2.4 or newer, and 1.3.4 sorts below that. 1.3.2 relaxes a sibling mod's range on every host, but the mod may still need Farmer's Delight's 1.20.1 API.

Loaded with no content before snapshot.2, it registers everything through the bundled Critter library, whose remapped nested bytecode was being discarded. Fixed in snapshot.2 (#71): nested JIJ libraries keep their remap now.

shows error "SCP: Lockdown (scp) has failed to load correctly" "java.lang.NoClassDefFoundError: net/minecraft/properties/IProperty"

- Load game - Retromod and forge loads - No srparasites Im not completely sure if I followed the steps correctly so take everything here with a grain of salt [SRParasites-1.10.7.jar.txt](https://github.com/user-attachments/files/29431672/SRParasites-1.10.7.jar.txt)

The original report (issue 249) crashed on a call to Lifecycle, which rc-1 fixed. Both jars now transform without error. What stops them is two model bases Minecraft removed, ItemOverrides and AgeableListModel, which BackpackDynamicModel and BackpackModel extend. Neither can be rebased. EntityModel survives but its whole contract changed at 26.x, from a type parameter of Entity to one of EntityRenderState and from a no-argument constructor to one taking a ModelPart, and setupAnim is gone. A stand-in base would link and then draw nothing, so Retromod reports the missing base by name instead. This needs a real port of the mod's rendering.

IncompatibleClassChangeError on Lifecycle.stable(), which needs an interface method reference, followed by a VerifyError in the backpacks entrypoint. Not retested since.

The bytecode side mostly works (the game reaches the title screen), but the mod ships datapack worldgen, biomes, configured/placed features, carvers, in 1.20.1 JSON formats that 26.1 can't parse (schema changes plus renamed c: tag conventions). Registry loading fails, which blocks entering or creating ANY world while the mod is present. Migrating datapack data across MC versions is a separate subsystem Retromod doesn't have yet. Its entity registration also trips a FabricEntityTypeBuilder inner-class gap (tracked).

``` [12:16:52] [main/WARN]: Mixin apply for mod species failed species.mixins.json:LivingEntityMixin from mod species -> net.minecraft.world.entity.LivingEntity: org.spongepowered.asm.mixin.transformer.throwables.InvalidMixinException @Shadow method hasEffect(Lnet/minecraft/world/effect/MobEffect;)Z in species.mixins.json:LivingEntityMixin from mod species was not located in the target class net.minecraft.world.entity.LivingEntity. Using refmap species-refmap.json ... [12:16:55] [main/WARN]: Mixin apply for mod species failed species.mixins.json:PoseMixin from mod species -> net.minecraft.world.entity.Pose: org.spongepowered.asm.mixin.gen.throwables.InvalidAccessorException No candidates were found matching <init>(Ljava/lang/String;I)V in net/minecraft/world/entity/Pose for species.mixins.json:PoseMixin from mod species->@Invoker[OBJECT_FACTORY]::newPose(Ljava/lang/String;I)Lnet/minecraft/world/entity/Pose; [ -> Locate -> species.mixins.json:PoseMixin from mod species->@Invoker[OBJECT_FACTORY]::newPose(Ljava/lang/String;I)Lnet/minecraft/world/entity/Pose;] ... [12:16:56] [main/WARN]: Mixin apply for mod species failed species.mixins.json:TreeDecoratorTypeAccessor from mod species -> net.minecraft.world.level.levelgen.feature.treedecorators.TreeDecoratorType: org.spongepowered.asm.mixin.gen.throwables.InvalidAccessorException No candidates were found matching register(Ljava/lang/String;Lcom/mojang/serialization/Codec;)Lnet/minecraft/world/level/levelgen/feature/treedecorators/TreeDecoratorType; in net/minecraft/world/level/levelgen/feature/treedecorators/TreeDecoratorType for species.mixins.json:TreeDecoratorTypeAccessor from mod species->@Invoker[METHOD_PROXY]::callRegister(Ljava/lang/String;Lcom/mojang/serialization/Codec;)Lnet/minecraft/world/level/levelgen/feature/treedecorators/TreeDecoratorType; [ -> Locate -> species.mixins.json:TreeDecoratorTypeAccessor from mod species->@Invoker[METHOD_PROXY]::callRegister(Ljava/lang/String;Lcom/mojang/serialization/Codec;)Lnet/minecraft/world/level/levelgen/feature/treedecorators/TreeDecoratorType;] org.spongepowered.asm.mixin.gen.throwables.InvalidAccessorException: No candidates were found matching register(Ljava/lang/String;Lcom/mojang/serialization/Codec;)Lnet/minecraft/world/level/levelgen/feature/treedecorators/TreeDecoratorType; in net/minecraft/world/level/levelgen/feature/treedecorators/TreeDecoratorType for species.mixins.json:TreeDecoratorTypeAccessor from mod species->@Invoker[METHOD_PROXY]::callRegister(Ljava/lang/String;Lcom/mojang/serialization/Codec;)Lnet/minecraft/world/level/levelgen/feature/treedecorators/TreeDecoratorType; [ -> Locate -> species.mixins.json:TreeDecoratorTypeAccessor from mod species->@Invoker[METHOD_PROXY]::callRegister(Ljava/lang/String;Lcom/mojang/serialization/Codec;)Lnet/minecraft/world/level/levelgen/feature/treedecorators/TreeDecoratorType;] at org.spongepowered.asm.mixin.gen.InvokerInfo.findTargetMethod(InvokerInfo.java:120) ... [12:16:58] [Render thread/INFO]: [STDERR]: [Retromod] Non-fatal: entrypoint failed in com.ninni.species.Species: java.lang.NoClassDefFoundError: net/minecraft/advancements/critereon/AbstractCriterionTriggerInstance [12:16:58] [Render thread/INFO]: [STDERR]: java.lang.NoClassDefFoundError: net/minecraft/advancements/critereon/AbstractCriterionTriggerInstance [12:16:58] [Render thread/INFO]: [STDERR]: at knot//com.ninni.species.criterion.SpeciesCriterion.init(SpeciesCriterion.java:19) [12:16:58] [Render thread/INFO]: [STDERR]: at knot//com.ninni.species.Species.onInitialize(Species.java:34) [12:16:58] [Render thread/INFO]: [STDERR]: at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:409) [12:16:58] [Render thread/INFO]: [STDERR]: at net.fabricmc.loader.impl.game.minecraft.Hooks.startClient(Hooks.java:52) [12:16:58] [Render thread/INFO]: [STDERR]: at knot//net.minecraft.client.Minecraft.<init>(Minecraft.java:477) [12:16:58] [Render thread/INFO]: [STDERR]: at knot//net.minecraft.client.main.Main.main(Main.java:232) [12:16:58] [Render thread/INFO]: [STDERR]: at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:514) [12:16:58] [Render thread/INFO]: [STDERR]: at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:72) [12:16:58] [Render thread/INFO]: [STDERR]: at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23) [12:16:58] [Render thread/INFO]: [STDERR]: Caused by: java.lang.ClassNotFoundException: net.minecraft.advancements.critereon.AbstractCriterionTriggerInstance [12:16:58] [Render thread/INFO]: [STDERR]: at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:580) [12:16:58] [Render thread/INFO]: [STDERR]: at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:490) [12:16:58] [Render thread/INFO]: [STDERR]: at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:239) [12:16:58] [Render thread/INFO]: [STDERR]: at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:119) [12:16:58] [Render thread/INFO]: [STDERR]: at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:490) [12:16:58] [Render thread/INFO]: [STDERR]: ... 9 more ```

Crashes immediately upon trying to launch. java.lang.RuntimeException: Could not execute entrypoint stage 'main' due to errors, provided by 'striders-grace' at 'accieo.striders.grace.StridersGrace'! at net.fabricmc.loader.impl.FabricLoaderImpl.lambda$invokeEntrypoints$0(FabricLoaderImpl.java:413) at net.fabricmc.loader.impl.util.ExceptionUtil.gatherExceptions(ExceptionUtil.java:33) at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:411) at net.fabricmc.loader.impl.game.minecraft.Hooks.startClient(Hooks.java:52) at knot//net.minecraft.client.Minecraft.<init>(Minecraft.java:456) at knot//net.minecraft.client.main.Main.main(Main.java:278) at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:514) at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:72) at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23) at org.prismlauncher.launcher.impl.StandardLauncher.launch(StandardLauncher.java:115) at org.prismlauncher.EntryPoint.listen(EntryPoint.java:129) at org.prismlauncher.EntryPoint.main(EntryPoint.java:70) Caused by: java.lang.IncompatibleClassChangeError: class accieo.striders.grace.StridersGraceEnchantment cannot inherit from final class net.minecraft.world.item.enchantment.Enchantment at java.base/java.lang.ClassLoader.defineClass1(Native Method) at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:962) at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:144) at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.defineClassFwd(KnotClassLoader.java:165) at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:368) at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:231) at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:119) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:490) at java.base/java.lang.Class.forName0(Native Method) at java.base/java.lang.Class.forName(Class.java:547) at net.fabricmc.loader.impl.util.DefaultLanguageAdapter.create(DefaultLanguageAdapter.java:53) at net.fabricmc.loader.impl.entrypoint.EntrypointStorage$NewEntry.getOrCreate(EntrypointStorage.java:124) at net.fabricmc.loader.impl.entrypoint.EntrypointContainerImpl.getEntrypoint(EntrypointContainerImpl.java:53) at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:409) ... 9 more

after relaunching the game it refuses to load and says "Thaumcraft (thaumcraft) has failed to load correctly" with "java.lang.NoClassFoundError: net/minecraft/command/Icommand

[04:35:54] [Render thread/INFO]: [STDERR]: [Render thread] INFO retromod - AOT compiling [2/3]: flying_things-1.8.9-1.15.2-original-retromod.jar [04:35:54] [Render thread/INFO]: [STDERR]: [Render thread] INFO retromod-aot - AOT compiling: flying_things-1.8.9-1.15.2-original-retromod.jar [04:35:54] [Render thread/INFO]: [STDERR]: [Render thread] INFO retromod-aot - Created backup: mods\retromod-backups\flying_things-1.8.9-1.15.2-original-retromod.jar [04:35:54] [Render thread/INFO]: [STDERR]: [Render thread] WARN retromod-aot - Hybrid compilation failed for com/retromod/shim/common/embedded/IsOverloadBridge, using simple transform [04:35:54] [Render thread/INFO]: [STDERR]: [Render thread] ERROR retromod-aot - AOT compilation failed: flying_things-1.8.9-1.15.2-original-retromod.jar [04:35:54] [Render thread/INFO]: [STDERR]: java.lang.NegativeArraySizeException: -1 [04:35:54] [Render thread/INFO]: [STDERR]: at org.objectweb.asm.Frame.merge(Frame.java:1234) [04:35:54] [Render thread/INFO]: [STDERR]: at org.objectweb.asm.MethodWriter.computeAllFrames(MethodWriter.java:1612) [04:35:54] [Render thread/INFO]: [STDERR]: at org.objectweb.asm.MethodWriter.visitMaxs(MethodWriter.java:1548) [04:35:54] [Render thread/INFO]: [STDERR]: at org.objectweb.asm.MethodVisitor.visitMaxs(MethodVisitor.java:787) [04:35:54] [Render thread/INFO]: [STDERR]: at org.objectweb.asm.ClassReader.readCode(ClassReader.java:2664) [04:35:54] [Render thread/INFO]: [STDERR]: at org.objectweb.asm.ClassReader.readMethod(ClassReader.java:1512) [04:35:54] [Render thread/INFO]: [STDERR]: at org.objectweb.asm.ClassReader.accept(ClassReader.java:745) [04:35:54] [Render thread/INFO]: [STDERR]: at org.objectweb.asm.ClassReader.accept(ClassReader.java:425) [04:35:54] [Render thread/INFO]: [STDERR]: at knot//com.retromod.aot.AotCompiler.transformClassSimple(AotCompiler.java:475) [04:35:54] [Render thread/INFO]: [STDERR]: at knot//com.retromod.aot.AotCompiler.transformClassAot(AotCompiler.java:462) [04:35:54] [Render thread/INFO]: [STDERR]: at knot//com.retromod.aot.AotCompiler.compileJar(AotCompiler.java:280) [04:35:54] [Render thread/INFO]: [STDERR]: at knot//com.retromod.aot.AotCompiler.compileModAot(AotCompiler.java:142) [04:35:54] [Render thread/INFO]: [STDERR]: at knot//com.retromod.aot.AotCompiler.compileAllModsSync(AotCompiler.java:221) [04:35:54] [Render thread/INFO]: [STDERR]: at knot//com.retromod.core.Retromod.performAotCompilation(Retromod.java:430) [04:35:54] [Render thread/INFO]: [STDERR]: at knot//com.retromod.core.Retromod.onInitialize(Retromod.java:240) [04:35:54] [Render thread/INFO]: [STDERR]: at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:409) [04:35:54] [Render thread/INFO]: [STDERR]: at net.fabricmc.loader.impl.game.minecraft.Hooks.startClient(Hooks.java:52) [04:35:54] [Render thread/INFO]: [STDERR]: at knot//net.minecraft.client.Minecraft.<init>(Minecraft.java:456) [04:35:54] [Render thread/INFO]: [STDERR]: at knot//net.minecraft.client.main.Main.main(Main.java:278) [04:35:54] [Render thread/INFO]: [STDERR]: at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:514) [04:35:54] [Render thread/INFO]: [STDERR]: at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:72) [04:35:54] [Render thread/INFO]: [STDERR]: at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23) [04:35:54] [Render thread/INFO]: [STDERR]: at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) [04:35:54] [Render thread/INFO]: [STDERR]: at java.base/java.lang.reflect.Method.invoke(Method.java:565) [04:35:54] [Render thread/INFO]: [STDERR]: at com.modrinth.theseus.MinecraftLaunch.relaunch(MinecraftLaunch.java:61) [04:35:54] [Render thread/INFO]: [STDERR]: at com.modrinth.theseus.MinecraftLaunch.main(MinecraftLaunch.java:28) Will provide the log soon, as it seems it's too big to be put into "Details".

- Minecraft loads - New world creation screen doesn't load and loading loops on "Preparing for world creation..." screen - Log snippet: [17:16:57] [Worker-Main-4/ERROR]: Couldn't load tag minecraft:music_discs as it is missing following references: the_knocker:knocker_disc (from the_knocker) [17:16:57] [Worker-Main-4/ERROR]: Couldn't load tag minecraft:mineable/axe as it is missing following references: the_knocker:bridge (from the_knocker) [17:16:57] [Worker-Main-4/ERROR]: Couldn't load tag minecraft:aquatic as it is missing following references: the_knocker:knockerswim (from the_knocker) [17:16:57] [Worker-Main-4/ERROR]: Couldn't load tag minecraft:sensitive_to_impaling as it is missing following references: #minecraft:aquatic (from vanilla) [17:16:58] [Worker-Main-4/ERROR]: Registry loading errors: > Errors in registry minecraft:enchantment: >> Errors in element minecraft:impaling: java.lang.IllegalStateException: Failed to parse minecraft:impaling from pack vanilla at knot//net.minecraft.resources.RegistryLoadTask$PendingRegistration.loadFromResource(RegistryLoadTask.java:115) at knot//net.minecraft.resources.ResourceManagerRegistryLoadTask.lambda$load$2(ResourceManagerRegistryLoadTask.java:46) at knot//net.minecraft.util.thread.ParallelMapTransform$Container.applyOperation(ParallelMapTransform.java:89) at knot//net.minecraft.util.thread.ParallelMapTransform$SingleTaskSplitter.lambda$scheduleBatch$0(ParallelMapTransform.java:160) at java.base/java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1825) at java.base/java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1817) at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:511) at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1450) at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:2019) at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:187) Caused by: java.lang.IllegalStateException: Missing tag: 'minecraft:sensitive_to_impaling' in 'minecraft:entity_type' missed input: {"minecraft:entity_type":"#minecraft:sensitive_to_impaling"} missed input: {"minecraft:damage":[{"effect":{"type":"minecraft:add","value":{"type":"minecraft:linear","base":2.5,"per_level_above_first":2.5}},"requirements":{"condition":"minecraft:entity_properties","entity":"this","predicate":{"minecraft:entity_type":"#minecraft:sensitive_to_impaling"}}}]} at knot//com.mojang.serialization.DataResult$Error.getOrThrow(DataResult.java:287) at knot//com.mojang.serialization.DataResult.getOrThrow(DataResult.java:81) at knot//net.minecraft.resources.RegistryLoadTask$PendingRegistration.loadFromResource(RegistryLoadTask.java:113) ... 9 more > Errors in registry minecraft:root: >> Errors in element minecraft:enchantment: java.lang.IllegalStateException: Unbound values in registry ResourceKey[minecraft:root / minecraft:enchantment]: [minecraft:impaling] at knot//net.minecraft.core.MappedRegistry.freeze(MappedRegistry.java:300) at knot//net.minecraft.resources.RegistryLoadTask.freezeRegistry(RegistryLoadTask.java:87) at knot//net.minecraft.resources.RegistryDataLoader.lambda$load$3(RegistryDataLoader.java:228) at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:196) at java.base/java.util.AbstractList$RandomAccessSpliterator.forEachRemaining(AbstractList.java:722) at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:570) at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:560) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:635) at java.base/java.util.stream.AbstractPipeline.evaluateToArrayNode(AbstractPipeline.java:291) at java.base/java.util.stream.ReferencePipeline.toArray(ReferencePipeline.java:652) at java.base/java.util.stream.ReferencePipeline.toArray(ReferencePipeline.java:658) at java.base/java.util.stream.ReferencePipeline.toList(ReferencePipeline.java:663) at knot//net.minecraft.resources.RegistryDataLoader.lambda$load$2(RegistryDataLoader.java:228) at knot//net.minecraft.resources.RegistryDataLoader.mde85c2c$fabric-registry-sync-v0$lambda$thenApplyAsync$1$1(RegistryDataLoader.java:565) at java.base/jdk.internal.vm.ScopedValueContainer.callWithoutScope(ScopedValueContainer.java:162) at java.base/jdk.internal.vm.ScopedValueContainer.call(ScopedValueContainer.java:147) at java.base/java.lang.ScopedValue$Carrier.call(ScopedValue.java:424) at knot//net.minecraft.resources.RegistryDataLoader.mde85c2c$fabric-registry-sync-v0$lambda$thenApplyAsync$0$0(RegistryDataLoader.java:565) at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:667) at java.base/java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:504) at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:511) at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1450) at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:2019) at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:187) [17:16:58] [Render thread/ERROR]: Negative index in crash report handler (14/18) [17:16:58] [Render thread/ERROR]: Error executing task on Client net.minecraft.ReportedException: Registry Loading at knot//net.minecraft.client.MouseHandler.onButton(MouseHandler.java:128) at knot//net.minecraft.client.MouseHandler.lambda$setup$3(MouseHandler.java:239) at knot//net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:173) at knot//net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:23) at knot//net.minecraft.util.thread.BlockableEventLoop.execute(BlockableEventLoop.java:114) at knot//net.minecraft.client.MouseHandler.lambda$setup$2(MouseHandler.java:239) at knot//org.lwjgl.glfw.GLFWMouseButtonCallbackI.callback(GLFWMouseButtonCallbackI.java:34) at knot//org.lwjgl.system.JNI.invokeV(Native Method) at knot//org.lwjgl.glfw.GLFW.glfwPollEvents(GLFW.java:1600) at knot//com.mojang.blaze3d.systems.RenderSystem.pollEvents(RenderSystem.java:117) at knot//net.minecraft.client.Minecraft.run(Minecraft.java:958) at knot//net.minecraft.client.main.Main.main(Main.java:292) at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:514) at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:72) at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23) at org.prismlauncher.launcher.impl.StandardLauncher.launch(StandardLauncher.java:115) at org.prismlauncher.EntryPoint.listen(EntryPoint.java:129) at org.prismlauncher.EntryPoint.main(EntryPoint.java:70) Caused by: java.lang.IllegalStateException: Failed to load registries due to errors at knot//net.minecraft.resources.RegistryDataLoader.createReportWithBriefInfo(RegistryDataLoader.java:284) at knot//net.minecraft.resources.RegistryDataLoader.logErrors(RegistryDataLoader.java:265) at knot//net.minecraft.resources.RegistryDataLoader.lambda$load$2(RegistryDataLoader.java:230) at knot//net.minecraft.resources.RegistryDataLoader.mde85c2c$fabric-registry-sync-v0$lambda$thenApplyAsync$1$1(RegistryDataLoader.java:565) at java.base/jdk.internal.vm.ScopedValueContainer.callWithoutScope(ScopedValueContainer.java:162) at java.base/jdk.internal.vm.ScopedValueContainer.call(ScopedValueContainer.java:147) at java.base/java.lang.ScopedValue$Carrier.call(ScopedValue.java:424) at knot//net.minecraft.resources.RegistryDataLoader.mde85c2c$fabric-registry-sync-v0$lambda$thenApplyAsync$0$0(RegistryDataLoader.java:565) at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:667) at java.base/java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:504) at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:511) at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1450) at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:2019) at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:187)

[2026-08-26 20:49:27.456] [INFO] [dev.kostromdan.mods.crash_assistant.app.CrashAssistantApp]: Reading finished in 7 ms [2026-08-26 20:49:27.716] [INFO] [LogAnalysisScripts]: Running script: log_analysis/example.jexl [2026-08-26 20:49:27.774] [INFO] [dev.kostromdan.mods.crash_assistant.app.CrashAssistantApp]: Analysis finished in 363 ms [2026-08-26 20:49:27.786] [INFO] [dev.kostromdan.mods.crash_assistant.app.CrashAssistantApp]: Showing KnownCrashReason: MissingUnsupportedDependencies We detected a dependency conflict in the **latest.log**. Missing or unsupported mandatory dependencies: Mod ID: 'minecraft', Requested by: 'the_slumbering_omen', Expected range: '[1.19.2,1.19.2]', Actual version: '1.20.1' To resolve this issue, please **carefully** read the above message and attempt to resolve all conflicts. Mapping of mod IDs to JAR names (for reference only): the_slumbering_omen -> theslumberingomen4.2unfinished.jar [2026-08-26 20:49:36.445] [INFO] [dev.kostromdan.mods.crash_assistant.app.CrashAssistantApp]: Shown KnownCrashReason: MissingUnsupportedDependencies (Seen warning for 8.586s) [2026-08-26 20:50:03.036] [INFO] [dev.kostromdan.mods.crash_assistant.app.CrashAssistantApp]: Crash Assistant closed.

Crashed on world create before snapshot.1 (ClassCastException in its LightTexture mixin). The render mixins are whole-class-stripped now (#68), so worlds load, but that means the actual darkness effect doesn't apply.

The mod that drove the snapshot.7 worldgen chain. Its Reflections-based AutoRegister system found nothing in transformed jars (missing zip directory entries), its bundled javassist was corrupted by re-serialization, and the 26.x codec/registry reworks broke its structure types; all fixed. Verified on a 26.2 dedicated server: every worldgen registry binds with zero errors and jigsaw structure assembly runs clean. Server-verified; client-side rendering not separately exercised.

Needs YUNG's API (translated, see its entry) and Cloth Config (a native 26.2 build exists on Modrinth). On a 26.2 dedicated server, /locate finds a small_dungeon and /place generates one with zero errors; the jigsaw generation path needed the snapshot.7 JigsawBlockInfo bridges. Verified via server commands; natural exploration in a client session not yet play-tested.

java.lang.NoClassDefFoundError: net/minecraft/block/FlowingFluidBlock

doesn't load