---- Minecraft Crash Report ---- // Why is it breaking :( Time: 2025-07-13 21:02:59 Description: Unexpected error java.lang.NoClassDefFoundError: com/jozufozu/flywheel/backend/Backend at mod.adrenix.nostalgic.forge.mixin.util.FlywheelForgeHelper.sendLightUpdate(FlywheelForgeHelper.java:24) ~[NostalgicTweaks-mc1.20.1-Forge-2.0.0-beta.910.jar%23156!/:?] {re:mixin,re:classloading} at net.minecraft.client.renderer.LevelRenderer.handler$zob000$nt_forge_flywheel_world_lighting$onCompileChunks(LevelRenderer.java:7103) ~[client-1.20.1-20230612.114412-srg.jar%23157!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:runtimedistcleaner:A} at net.minecraft.client.renderer.LevelRenderer.m_194370_(LevelRenderer.java) ~[client-1.20.1-20230612.114412-srg.jar%23157!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:runtimedistcleaner:A} at net.minecraft.client.renderer.LevelRenderer.m_109599_(LevelRenderer.java:1164) ~[client-1.20.1-20230612.114412-srg.jar%23157!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:runtimedistcleaner:A} at net.minecraft.client.renderer.GameRenderer.m_109089_(GameRenderer.java:1126) ~[client-1.20.1-20230612.114412-srg.jar%23157!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:runtimedistcleaner:A} at net.minecraft.client.renderer.GameRenderer.m_109093_(GameRenderer.java:909) ~[client-1.20.1-20230612.114412-srg.jar%23157!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:runtimedistcleaner:A} at net.minecraft.client.Minecraft.m_91383_(Minecraft.java:1146) ~[client-1.20.1-20230612.114412-srg.jar%23157!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:flywheel.impl.mixins.json:MinecraftMixin,pl:mixin:APP:architectury.mixins.json:MixinMinecraft,pl:mixin:APP:ponder-common.mixins.json:client.WindowResizeMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:gameplay.food_health.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:animation.swing.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.debug_screen.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.progress_screen.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.uncap_title_fps.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.window_title.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.world_lighting.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:gameplay.combat_bow.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:gameplay.combat_player.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:sound.game_music.MinecraftMixin,pl:mixin:A,pl:runtimedistcleaner:A} at net.minecraft.client.Minecraft.m_91374_(Minecraft.java:718) ~[client-1.20.1-20230612.114412-srg.jar%23157!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:flywheel.impl.mixins.json:MinecraftMixin,pl:mixin:APP:architectury.mixins.json:MixinMinecraft,pl:mixin:APP:ponder-common.mixins.json:client.WindowResizeMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:gameplay.food_health.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:animation.swing.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.debug_screen.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.progress_screen.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.uncap_title_fps.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.window_title.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.world_lighting.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:gameplay.combat_bow.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:gameplay.combat_player.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:sound.game_music.MinecraftMixin,pl:mixin:A,pl:runtimedistcleaner:A} at net.minecraft.client.main.Main.main(Main.java:218) ~[forge-47.4.0.jar:?] {re:classloading,pl:runtimedistcleaner:A} at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?] {} at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?] {} at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?] {} at java.lang.reflect.Method.invoke(Method.java:569) ~[?:?] {} at net.minecraftforge.fml.loading.targets.CommonLaunchHandler.runTarget(CommonLaunchHandler.java:111) ~[fmlloader-1.20.1-47.4.0.jar:?] {} at net.minecraftforge.fml.loading.targets.CommonLaunchHandler.clientService(CommonLaunchHandler.java:99) ~[fmlloader-1.20.1-47.4.0.jar:?] {} at net.minecraftforge.fml.loading.targets.CommonClientLaunchHandler.lambda$makeService$0(CommonClientLaunchHandler.java:25) ~[fmlloader-1.20.1-47.4.0.jar:?] {} at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:30) ~[modlauncher-10.0.9.jar:?] {} at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) ~[modlauncher-10.0.9.jar:?] {} at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) ~[modlauncher-10.0.9.jar:?] {} at cpw.mods.modlauncher.Launcher.run(Launcher.java:108) ~[modlauncher-10.0.9.jar:?] {} at cpw.mods.modlauncher.Launcher.main(Launcher.java:78) ~[modlauncher-10.0.9.jar:?] {} at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) ~[modlauncher-10.0.9.jar:?] {} at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) ~[modlauncher-10.0.9.jar:?] {} at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:141) ~[bootstraplauncher-1.1.2.jar:?] {} Caused by: java.lang.ClassNotFoundException: com.jozufozu.flywheel.backend.Backend at jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641) ~[?:?] {} at java.lang.ClassLoader.loadClass(ClassLoader.java:525) ~[?:?] {} at cpw.mods.cl.ModuleClassLoader.loadClass(ModuleClassLoader.java:137) ~[securejarhandler-2.1.10.jar:?] {} at java.lang.ClassLoader.loadClass(ClassLoader.java:525) ~[?:?] {} at cpw.mods.cl.ModuleClassLoader.loadClass(ModuleClassLoader.java:137) ~[securejarhandler-2.1.10.jar:?] {} at java.lang.ClassLoader.loadClass(ClassLoader.java:525) ~[?:?] {} ... 24 more A detailed walkthrough of the error, its code path and all known details is as follows: --------------------------------------------------------------------------------------- -- Head -- Thread: Render thread Suspected Mod: Nostalgic Tweaks (nostalgic_tweaks), Version: 2.0.0-beta.910 Issue tracker URL: https://github.com/Adrenix/Nostalgic-Tweaks/issues at TRANSFORMER/nostalgic_tweaks@2.0.0-beta.910/mod.adrenix.nostalgic.forge.mixin.util.FlywheelForgeHelper.sendLightUpdate(FlywheelForgeHelper.java:24) Stacktrace: at mod.adrenix.nostalgic.forge.mixin.util.FlywheelForgeHelper.sendLightUpdate(FlywheelForgeHelper.java:24) ~[NostalgicTweaks-mc1.20.1-Forge-2.0.0-beta.910.jar%23156!/:?] {re:mixin,re:classloading} at net.minecraft.client.renderer.LevelRenderer.handler$zob000$nt_forge_flywheel_world_lighting$onCompileChunks(LevelRenderer.java:7103) ~[client-1.20.1-20230612.114412-srg.jar%23157!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:runtimedistcleaner:A} at net.minecraft.client.renderer.LevelRenderer.m_194370_(LevelRenderer.java) ~[client-1.20.1-20230612.114412-srg.jar%23157!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:runtimedistcleaner:A} at net.minecraft.client.renderer.LevelRenderer.m_109599_(LevelRenderer.java:1164) ~[client-1.20.1-20230612.114412-srg.jar%23157!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:runtimedistcleaner:A} at net.minecraft.client.renderer.GameRenderer.m_109089_(GameRenderer.java:1126) ~[client-1.20.1-20230612.114412-srg.jar%23157!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:runtimedistcleaner:A} -- Affected level -- Details: All players: 1 total; [LocalPlayer['Schlagot'/154, l='ClientLevel', x=-1.50, y=64.00, z=-0.50]] Chunk stats: 961, 441 Level dimension: minecraft:overworld Level spawn location: World: (0,63,0), Section: (at 0,15,0 in 0,3,0; chunk contains blocks 0,-64,0 to 15,319,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,-64,0 to 511,319,511) Level time: 16 game time, 16 day time Server brand: forge Server type: Integrated singleplayer server Stacktrace: at net.minecraft.client.multiplayer.ClientLevel.m_6026_(ClientLevel.java:455) ~[client-1.20.1-20230612.114412-srg.jar%23157!/:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:architectury.mixins.json:MixinClientLevel,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.player_particles.ClientLevelMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.world_fog.ClientLevelMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.world_lighting.ClientLevelMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.world_sky.ClientLevelMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:sound.position_sound.ClientLevelMixin,pl:mixin:A,pl:runtimedistcleaner:A} at net.minecraft.client.Minecraft.m_91354_(Minecraft.java:2319) ~[client-1.20.1-20230612.114412-srg.jar%23157!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:flywheel.impl.mixins.json:MinecraftMixin,pl:mixin:APP:architectury.mixins.json:MixinMinecraft,pl:mixin:APP:ponder-common.mixins.json:client.WindowResizeMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:gameplay.food_health.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:animation.swing.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.debug_screen.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.progress_screen.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.uncap_title_fps.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.window_title.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.world_lighting.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:gameplay.combat_bow.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:gameplay.combat_player.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:sound.game_music.MinecraftMixin,pl:mixin:A,pl:runtimedistcleaner:A} at net.minecraft.client.Minecraft.m_91374_(Minecraft.java:740) ~[client-1.20.1-20230612.114412-srg.jar%23157!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:flywheel.impl.mixins.json:MinecraftMixin,pl:mixin:APP:architectury.mixins.json:MixinMinecraft,pl:mixin:APP:ponder-common.mixins.json:client.WindowResizeMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:gameplay.food_health.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:animation.swing.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.debug_screen.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.progress_screen.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.uncap_title_fps.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.window_title.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:candy.world_lighting.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:gameplay.combat_bow.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:gameplay.combat_player.MinecraftMixin,pl:mixin:APP:mixin.nostalgic_tweaks.json:sound.game_music.MinecraftMixin,pl:mixin:A,pl:runtimedistcleaner:A} at net.minecraft.client.main.Main.main(Main.java:218) ~[forge-47.4.0.jar:?] {re:classloading,pl:runtimedistcleaner:A} at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?] {} at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?] {} at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?] {} at java.lang.reflect.Method.invoke(Method.java:569) ~[?:?] {} at net.minecraftforge.fml.loading.targets.CommonLaunchHandler.runTarget(CommonLaunchHandler.java:111) ~[fmlloader-1.20.1-47.4.0.jar:?] {} at net.minecraftforge.fml.loading.targets.CommonLaunchHandler.clientService(CommonLaunchHandler.java:99) ~[fmlloader-1.20.1-47.4.0.jar:?] {} at net.minecraftforge.fml.loading.targets.CommonClientLaunchHandler.lambda$makeService$0(CommonClientLaunchHandler.java:25) ~[fmlloader-1.20.1-47.4.0.jar:?] {} at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:30) ~[modlauncher-10.0.9.jar:?] {} at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) ~[modlauncher-10.0.9.jar:?] {} at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) ~[modlauncher-10.0.9.jar:?] {} at cpw.mods.modlauncher.Launcher.run(Launcher.java:108) ~[modlauncher-10.0.9.jar:?] {} at cpw.mods.modlauncher.Launcher.main(Launcher.java:78) ~[modlauncher-10.0.9.jar:?] {} at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) ~[modlauncher-10.0.9.jar:?] {} at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) ~[modlauncher-10.0.9.jar:?] {} at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:141) ~[bootstraplauncher-1.1.2.jar:?] {} -- Last reload -- Details: Reload number: 1 Reload reason: initial Finished: Yes Packs: vanilla, mod_resources -- System Details -- Details: Minecraft Version: 1.20.1 Minecraft Version ID: 1.20.1 Operating System: Mac OS X (aarch64) version 14.5 Java Version: 17.0.15, Microsoft Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Microsoft Memory: 2926891792 bytes (2791 MiB) / 6014631936 bytes (5736 MiB) up to 16978542592 bytes (16192 MiB) CPUs: 12 Processor Vendor: Apple Inc. Processor Name: Apple M2 Max Identifier: Apple Inc. Family 0xda33d83d Model 0 Stepping 0 Microarchitecture: ARM64 SoC: Avalanche + Blizzard Frequency (GHz): 3.70 Number of physical packages: 1 Number of physical CPUs: 12 Number of logical CPUs: 12 Graphics card #0 name: Apple M2 Max Graphics card #0 vendor: Apple (0x106b) Graphics card #0 VRAM (MB): 0.00 Graphics card #0 deviceId: unknown Graphics card #0 versionInfo: unknown Memory slot #0 capacity (MB): 0.00 Memory slot #0 clockSpeed (GHz): 0.00 Memory slot #0 type: unknown Virtual memory max (MB): 65536.00 Virtual memory used (MB): 24839.89 Swap memory total (MB): 0.00 Swap memory used (MB): 0.00 JVM Flags: 2 total; -Xmx16192m -Xms256m Launched Version: forge-47.4.0 Backend library: LWJGL version 3.3.1 build 7 Backend API: Apple M2 Max GL version 4.1 Metal - 88.1, Apple Window size: 2048x1536 GL Caps: Using framebuffer using OpenGL 3.2 GL debug messages: Using VBOs: Yes Is Modded: Definitely; Client brand changed to 'forge'; Server brand changed to 'forge' Type: Integrated Server (map_client.txt) GPU Warnings: version: Metal Graphics mode: fancy Resource Packs: Current Language: en_us CPU: 12x Apple M2 Max Server Running: true Player Count: 1 / 8; [ServerPlayer['Schlagot'/154, l='ServerLevel[New World]', x=-1.50, y=64.00, z=-0.50]] Data Packs: vanilla, mod:mixinextras (incompatible), mod:forge, mod:flywheel, mod:architectury (incompatible), mod:ponder (incompatible), mod:create, mod:nostalgic_tweaks (incompatible), create:dynamic_data Enabled Feature Flags: minecraft:vanilla World Generation: Stable ModLauncher: 10.0.9+10.0.9+main.dcd20f30 ModLauncher launch target: forgeclient ModLauncher naming: srg ModLauncher services: mixin-0.8.5.jar mixin PLUGINSERVICE eventbus-6.0.5.jar eventbus PLUGINSERVICE fmlloader-1.20.1-47.4.0.jar slf4jfixer PLUGINSERVICE fmlloader-1.20.1-47.4.0.jar object_holder_definalize PLUGINSERVICE fmlloader-1.20.1-47.4.0.jar runtime_enum_extender PLUGINSERVICE fmlloader-1.20.1-47.4.0.jar capability_token_subclass PLUGINSERVICE accesstransformers-8.0.4.jar accesstransformer PLUGINSERVICE fmlloader-1.20.1-47.4.0.jar runtimedistcleaner PLUGINSERVICE modlauncher-10.0.9.jar mixin TRANSFORMATIONSERVICE modlauncher-10.0.9.jar fml TRANSFORMATIONSERVICE FML Language Providers: minecraft@1.0 lowcodefml@null javafml@null Mod List: client-1.20.1-20230612.114412-srg.jar |Minecraft |minecraft |1.20.1 |DONE |Manifest: ****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:**** mixinextras-forge-0.4.1.jar |MixinExtras |mixinextras |0.4.1 |DONE |Manifest: NOSIGNATURE forge-1.20.1-47.4.0-universal.jar |Forge |forge |47.4.0 |DONE |Manifest: ****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:**** flywheel-forge-1.20.1-1.0.4.jar |Flywheel |flywheel |1.0.4 |DONE |Manifest: NOSIGNATURE architectury-9.2.14-forge.jar |Architectury |architectury |9.2.14 |DONE |Manifest: NOSIGNATURE Ponder-Forge-1.20.1-1.0.80.jar |Ponder |ponder |1.0.80 |DONE |Manifest: NOSIGNATURE create-1.20.1-6.0.6.jar |Create |create |6.0.6 |DONE |Manifest: NOSIGNATURE NostalgicTweaks-mc1.20.1-Forge-2.0.0-beta.910.jar |Nostalgic Tweaks |nostalgic_tweaks |2.0.0-beta.910 |DONE |Manifest: NOSIGNATURE Crash Report UUID: 2fda8c26-3729-4c22-b975-39fc246cbe59 FML: 47.4 Forge: net.minecraftforge:47.4.0 Flywheel Backend: flywheel:instancing