i got a game crush
WARNING: coremods are present:
FMLLoadingPlugin (Skytils-0.1.2-pre10.jar)
FMLLoadingPlugin (Scrollable Tooltips-1.3 (1.8.9).jar)
PatcherTweaker (Patcher-1.5.1 (1.8.9).jar)
HCTweaker (HUDCaching-1.8-REL-for-MC1.8.9.jar)
ModTweaker (Patcher-1.5.1 (1.8.9).jar)
CTJSLoadingPlugin (ctjs-1.3.0-1.8.9.jar)
SkyblockAddonsLoadingPlugin (SkyblockAddons-1.8.9-1.5.5.jar)
Contact their authors BEFORE contacting forge

// Uh... Did I do that?

Time: 21-6-9 ??7:06
Description: Initializing game

java.lang.NoClassDefFoundError: net/minecraft/client/renderer/entity/layers/LayerCustomHead
at net.minecraft.client.renderer.entity.RenderBiped.(SourceFile:28)
at net.minecraft.client.renderer.entity.RenderBiped.(SourceFile:18)
at net.minecraft.client.renderer.entity.RenderSkeleton.(SourceFile:15)
at net.minecraft.client.renderer.entity.RenderManager.(RenderManager.java:163)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:481)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:329)
at net.minecraft.client.main.Main.main(SourceFile:124)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.renderer.entity.layers.LayerCustomHead
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 13 more
Caused by: org.spongepowered.asm.mixin.transformer.throwables.MixinTransformerError: An unexpected critical error was encountered
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:521)
at org.spongepowered.asm.mixin.transformer.Proxy.transform(Proxy.java:72)
at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279)
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176)
... 15 more
Caused by: org.spongepowered.asm.mixin.injection.throwables.InjectionError: Critical injection failure: Redirector redirect$renderEnchantedSkull$zgb000(Lnet/minecraft/client/renderer/tileentity/TileEntitySkullRenderer;FFFLnet/minecraft/util/EnumFacing;FILcom/mojang/authlib/GameProfile;ILnet/minecraft/entity/EntityLivingBase;FFFFFFF)V in mixins.skyblockcatia.json:renderer.entity.layers.LayerCustomHeadMixin failed injection check, (0/1) succeeded. Using refmap mixins.skyblockcatia.refmap.json
at org.spongepowered.asm.mixin.injection.struct.InjectionInfo.postInject(InjectionInfo.java:290)
at org.spongepowered.asm.mixin.transformer.MixinTargetContext.applyInjections(MixinTargetContext.java:1203)
at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.applyInjections(MixinApplicatorStandard.java:938)
at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.applyMixin(MixinApplicatorStandard.java:322)
at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.apply(MixinApplicatorStandard.java:280)
at org.spongepowered.asm.mixin.transformer.TargetClassContext.applyMixins(TargetClassContext.java:353)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.apply(MixinTransformer.java:724)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.applyMixins(MixinTransformer.java:703)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:509)
... 18 more

A detailed walkthrough of the error, its code path and all known details is as follows:

-- Head --
Stacktrace:
at net.minecraft.client.renderer.entity.RenderBiped.(SourceFile:28)
at net.minecraft.client.renderer.entity.RenderBiped.(SourceFile:18)
at net.minecraft.client.renderer.entity.RenderSkeleton.(SourceFile:15)
at net.minecraft.client.renderer.entity.RenderManager.(RenderManager.java:163)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:481)

-- Initialization --
Details:
Stacktrace:
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:329)
at net.minecraft.client.main.Main.main(SourceFile:124)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
ct.js modules: [Module{name=AntiDoubleDeath,folder=.\config\ChatTriggers\modules\AntiDoubleDeath,metadata=ModuleMetadata(name=AntiDoubleDeath, version=1.2.0, entry=main.js, asmEntry=null, asmExposedFunctions=null, tags=null, pictureLink=null, creator=Dolphin0xyz, description=This module prevents you getting wiped from the double death glitch by closing your client when you die, (with the vanilla death screen, you don't actually die on hypixel normally). Run /antidoubledeath to toggle the module, defaut is on. It only works if the server ip includes "hypixel"., requires=[SettingsManager, FileUtilities], helpMessage=&eRun &6/antidoubledeath &e for the settings., ignored=null, isRequired=false)}, Module{name=CustomTabCompletions,folder=.\config\ChatTriggers\modules\CustomTabCompletions,metadata=ModuleMetadata(name=CustomTabCompletions, version=1.0.2, entry=null, asmEntry=null, asmExposedFunctions=null, tags=null, pictureLink=null, creator=SirHyperNova, description=A module that allows you to add a custom tab completion function to commands., requires=null, helpMessage=null, ignored=null, isRequired=true)}, Module{name=DeepProxy,folder=.\config\ChatTriggers\modules\DeepProxy,metadata=ModuleMetadata(name=DeepProxy, version=2.0.0, entry=null, asmEntry=null, asmExposedFunctions=null, tags=null, pictureLink=null, creator=Ecolsson, description=null, requires=null, helpMessage=null, ignored=null, isRequired=false)}, Module{name=DungeonMilestones,folder=.\config\ChatTriggers\modules\DungeonMilestones,metadata=ModuleMetadata(name=Dungeon Milestone Tracker, version=1.0.0, entry=index.js, asmEntry=null, asmExposedFunctions=null, tags=null, pictureLink=null, creator=null, description=Track Milestone, requires=[PersistentData], helpMessage=null, ignored=null, isRequired=false)}, Module{name=DungeonUtilities,folder=.\config\ChatTriggers\modules\DungeonUtilities,metadata=ModuleMetadata(name=DungeonUtilities, version=0.9.9, entry=loader.js, asmEntry=null, asmExposedFunctions=null, tags=null, pictureLink=null, creator=null, description=null, requires=[SettingsManager, PersistentData], helpMessage=null, ignored=null, isRequired=false)}, Module{name=DwarvenUtilities,folder=.\config\ChatTriggers\modules\DwarvenUtilities,metadata=ModuleMetadata(name=DwarvenUtilities, version=1.0.4, entry=loader.js, asmEntry=null, asmExposedFunctions=null, tags=null, pictureLink=null, creator=null, description=&aUse &6/mines &ato open settings.

&7Support server: &bhttps://discord.gg/knjSZSC
, requires=[SettingsManager, PersistentData], helpMessage=null, ignored=null, isRequired=false)}, Module{name=Easy,folder=.\config\ChatTriggers\modules\Easy,metadata=ModuleMetadata(name=Easy, version=1.1.1, entry=index.js, asmEntry=null, asmExposedFunctions=null, tags=null, pictureLink=null, creator=null, description=Allows you to say EZ on Hypixel. Does not trigger on server commands., requires=[SettingsManager], helpMessage=null, ignored=null, isRequired=false)}, Module{name=FileUtilities,folder=.\config\ChatTriggers\modules\FileUtilities,metadata=ModuleMetadata(name=FileUtilities, version=2.5.0, entry=null, asmEntry=null, asmExposedFunctions=null, tags=null, pictureLink=null, creator=Dolphin0xyz, description=Utilities for files, requires=null, helpMessage=null, ignored=null, isRequired=true)}, Module{name=FishingUtilities,folder=.\config\ChatTriggers\modules\FishingUtilities,metadata=ModuleMetadata(name=FishingUtilities, version=1.4.0, entry=index.js, asmEntry=null, asmExposedFunctions=null, tags=null, pictureLink=null, creator=null, description=null, requires=[SettingsManager], helpMessage=null, ignored=null, isRequired=false)}, Module{name=PersistentData,folder=.\config\ChatTriggers\modules\PersistentData,metadata=ModuleMetadata(name=PersistentData, version=1.1.3, entry=null, asmEntry=null, asmExposedFunctions=null, tags=null, pictureLink=null, creator=null, description=Easily store data that persist between game and ct reloads, requires=[DeepProxy], helpMessage=null, ignored=null, isRequired=false)}, Module{name=PromiseV2,folder=.\config\ChatTriggers\modules\PromiseV2,metadata=ModuleMetadata(name=PromiseV2, version=1.0.4, entry=index.js, asmEntry=null, asmExposedFunctions=null, tags=null, pictureLink=null, creator=McPqndq, description=Promise polyfill, requires=null, helpMessage=null, ignored=null, isRequired=false)}, Module{name=PuzzlerSolver,folder=.\config\ChatTriggers\modules\PuzzlerSolver,metadata=ModuleMetadata(name=PuzzlerSolver, version=null, entry=index.js, asmEntry=null, asmExposedFunctions=null, tags=null, pictureLink=null, creator=null, description=Dwarven Mines puzzler solver for skyblock., requires=null, helpMessage=null, ignored=null, isRequired=false)}, Module{name=SettingsManager,folder=.\config\ChatTriggers\modules\SettingsManager,metadata=ModuleMetadata(name=SettingsManager, version=1.2.1, entry=null, asmEntry=null, asmExposedFunctions=null, tags=null, pictureLink=null, creator=null, description=Autogenerates a settings file and gui based on the object created and registers. Example usage can be found in UseExample.js, requires=null, helpMessage=null, ignored=null, isRequired=false)}]
Minecraft Version: 1.8.9
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 451197720 bytes (430 MB) / 872415232 bytes (832 MB) up to 2147483648 bytes (2048 MB)
JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP 9.19 Powered by Forge 11.15.1.2318 Optifine OptiFine_1.8.9_HD_U_M5 16 mods loaded, 16 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCH mcp{9.19} [Minecraft Coder Pack] (minecraft.jar)
UCH FML{8.0.99.99} [Forge Mod Loader] (forge-1.8.9-11.15.1.2318-1.8.9.jar)
UCH Forge{11.15.1.2318} [Minecraft Forge] (forge-1.8.9-11.15.1.2318-1.8.9.jar)
UCH modcore{0.1.47} [ModCore] (Sk1er Modcore-0.1.47 (1.8.9).jar)
UCH apec{1.9.2} [Apec] (Apec-1.9.2.jar)
UCH BazaarNotifier{1.4.0} [BazaarNotifier] (BazaarNotifier-1.4.0.jar)
UCH cowlection{1.8.9-0.13.0} [Cowlection] (Cowlection-1.8.9-0.13.0.jar)
UCH ct.js{1.3.0} [ChatTriggers] (ctjs-1.3.0-1.8.9.jar)
UCH Danker's Skyblock Mod{1.8.6} [Danker's Skyblock Mod] (Danker's Skyblock Mod - 1.8.6.jar)
UCH hudcaching{1.7-REL} [HUDCaching] (HUDCaching-1.8-REL-for-MC1.8.9.jar)
UCH notenoughupdates{2.0.0-REL} [NotEnoughUpdates] (NotEnoughUpdates-2.0-PRE27.jar)
UCH patcher{1.5.1} [Patcher] (Patcher-1.5.1 (1.8.9).jar)
UCH text_overflow_scroll{1.3} [Scrollable Tooltips] (Scrollable Tooltips-1.3 (1.8.9).jar)
UCH skyblockaddons{1.5.5} [SkyBlock Addons] (SkyblockAddons-1.8.9-1.5.5.jar)
UCH skyblockcatia{1.1.2} [SkyBlockcatia] (SkyBlockcatia-1.8.9-1.1.2.jar)
UCH skytils{0.1.2-pre10} [Skytils] (Skytils-0.1.2-pre10.jar)
Loaded coremods (and transformers):
FMLLoadingPlugin (Skytils-0.1.2-pre10.jar)

FMLLoadingPlugin (Scrollable Tooltips-1.3 (1.8.9).jar)
club.sk1er.mods.overflowscroll.forge.ClassTransformer
PatcherTweaker (Patcher-1.5.1 (1.8.9).jar)
club.sk1er.mods.core.forge.ClassTransformer
club.sk1er.patcher.tweaker.ClassTransformer
HCTweaker (HUDCaching-1.8-REL-for-MC1.8.9.jar)
io.github.moulberry.hudcaching.asm.ClassTransformer
ModTweaker (Patcher-1.5.1 (1.8.9).jar)
club.sk1er.patcher.tweaker.other.ModClassTransformer
CTJSLoadingPlugin (ctjs-1.3.0-1.8.9.jar)
com.chattriggers.ctjs.launch.plugin.CTJSTransformer
SkyblockAddonsLoadingPlugin (SkyblockAddons-1.8.9-1.5.5.jar)
codes.biscuit.skyblockaddons.tweaker.SkyblockAddonsTransformer
GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.6.0 NVIDIA 451.48' Renderer: 'GeForce GTX 1650/PCIe/SSE2'
Launched Version: 1.8.9-forge1.8.9-11.15.1.2318-1.8.9
LWJGL: 2.9.4
OpenGL: GeForce GTX 1650/PCIe/SSE2 GL version 4.6.0 NVIDIA 451.48, NVIDIA Corporation
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: Yes
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Packs: §r§lFurfSky §6§lReborn §8§lFL §8§l[§71.3§8§l] (2).zip
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 12x Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
OptiFine Version: OptiFine_1.8.9_HD_U_M5
OptiFine Build: 20210124-163719
Render Distance Chunks: 2
Mipmaps: 0
Anisotropic Filtering: 1
Antialiasing: 0
Multitexture: false
Shaders: null
OpenGlVersion: 4.6.0 NVIDIA 451.48
OpenGlRenderer: GeForce GTX 1650/PCIe/SSE2
OpenGlVendor: NVIDIA Corporation
CpuCount: 12

im using forge

Fixed in 1.2.0.