Forge Crashes on startup :/

[1mDecea5ed]

I just downloaded minecraft forge 1.12.2 to play the aether mod with some friends on a server, however, whenever forge finishes launching, it crashes. here is the error it shows in the minecraft launcher:

 java.lang.NoClassDefFoundError: net/minecraft/client/renderer/entity/layers/LayerDeadmau5Head

 

here is the full crash report:

---- Minecraft Crash Report ----

WARNING: coremods are present:
  FMLLoadingPlugin (Keystrokes-8.0.2 (1.8.9).jar)
Contact their authors BEFORE contacting forge

// Don't do that.

Time: 8/27/20 7:21 PM
Description: Initializing game

java.lang.NoClassDefFoundError: net/minecraft/client/renderer/entity/layers/LayerDeadmau5Head
    at net.minecraft.client.renderer.entity.RenderPlayer.<init>(RenderPlayer.java:45)
    at net.minecraft.client.renderer.entity.RenderPlayer.<init>(RenderPlayer.java:35)
    at net.minecraft.client.renderer.entity.RenderManager.<init>(RenderManager.java:227)
    at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:518)
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:378)
    at net.minecraft.client.main.Main.main(SourceFile:123)
    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.LayerDeadmau5Head
    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)
    ... 12 more
Caused by: net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerException: Exception in class transformer club.sk1er.mods.core.forge.ClassTransformer@506fd7ea from coremod FMLLoadingPlugin
    at net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerWrapper.transform(ASMTransformerWrapper.java:260)
    at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279)
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176)
    ... 14 more
Caused by: java.lang.NoClassDefFoundError: net/minecraft/util/IChatComponent
    at club.sk1er.mods.core.transform.Transformer.mapMethodName(Transformer.java:32)
    at club.sk1er.mods.core.transformers.LayerDeadmau5Transformer.transform(LayerDeadmau5Transformer.kt:13)
    at club.sk1er.mods.core.forge.ClassTransformer.transform(ClassTransformer.java:88)
    at net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerWrapper.transform(ASMTransformerWrapper.java:256)
    ... 16 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.util.IChatComponent
    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)
    ... 20 more
Caused by: java.lang.NullPointerException

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

-- Head --
Thread: Client thread
Stacktrace:
    at net.minecraft.client.renderer.entity.RenderPlayer.<init>(RenderPlayer.java:45)
    at net.minecraft.client.renderer.entity.RenderPlayer.<init>(RenderPlayer.java:35)
    at net.minecraft.client.renderer.entity.RenderManager.<init>(RenderManager.java:227)
    at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:518)

-- Initialization --
Details:
Stacktrace:
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:378)
    at net.minecraft.client.main.Main.main(SourceFile:123)
    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:
    Minecraft Version: 1.12.2
    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: 654622888 bytes (624 MB) / 1073741824 bytes (1024 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 9.42 Powered by Forge 14.23.5.2854 7 mods loaded, 7 mods active
    States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

    | State | ID            | Version      | Source                             | Signature                                |
    |:----- |:------------- |:------------ |:---------------------------------- |:---------------------------------------- |
    | L     | minecraft     | 1.12.2       | minecraft.jar                      | None                                     |
    | L     | mcp           | 9.42         | minecraft.jar                      | None                                     |
    | L     | FML           | 8.0.99.99    | forge-1.12.2-14.23.5.2854.jar      | e3c3d50c7c986df74c645c0ac54639741c90a557 |
    | L     | forge         | 14.23.5.2854 | forge-1.12.2-14.23.5.2854.jar      | e3c3d50c7c986df74c645c0ac54639741c90a557 |
    | L     | modcore       | 0.1.40       | Sk1er Modcore-0.1.40 (1.8.9).jar   | None                                     |
    | L     | keystrokesmod | 8.0.2        | Keystrokes-8.0.2 (1.8.9).jar       | None                                     |
    | L     | worldedit     | 1.0          | worldedit-forge-mc1.15.2-7.1.0.jar | None                                     |

    Loaded coremods (and transformers): 
FMLLoadingPlugin (Keystrokes-8.0.2 (1.8.9).jar)
  club.sk1er.mods.core.forge.ClassTransformer
    GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.6.0 NVIDIA 432.00' Renderer: 'GeForce GTX 950/PCIe/SSE2'
    Launched Version: 1.12.2-forge-14.23.5.2854
    LWJGL: 2.9.4
    OpenGL: GeForce GTX 950/PCIe/SSE2 GL version 4.6.0 NVIDIA 432.00, 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: vanilla, file/§bDynamic §7Duo §8Revamp §8[§732x§8].zip (incompatible)
    Current Language: English (US)
    Profiler Position: N/A (disabled)
    CPU: 4x Intel(R) Core(TM) i3-6100 CPU @ 3.70GHz

[DaemonUmbra]

1.12 is no longer supported on this forum.

Please update to a modern version of Minecraft to receive support.