Using 1.11.2 version of forge, other versions work perfectly fine. Have tried re-installing, etc. Even before the launch process begins the game crashes. I am just launching forge, no other modifications were set in place. Logs below, 

 

---- Minecraft Crash Report ----

WARNING: coremods are present:
Contact their authors BEFORE contacting forge

// Why did you do that?

Time: 2/5/17 9:19 AM
Description: Initializing game

java.lang.VerifyError: Bad return type
Exception Details:
  Location:
    Config.getDefiningResourcePack(Lnet/minecraft/network/datasync/EntityDataManager;)Lnet/minecraft/client/renderer/entity/layers/LayerDeadmau5Head; @48: areturn
  Reason:
    Type 'net/minecraft/client/renderer/entity/RenderWitherSkeleton' (current frame, stack[0]) is not assignable to 'net/minecraft/client/renderer/entity/layers/LayerDeadmau5Head' (from method signature)
  Current Frame:
    bci: @48
    flags: { }
    locals: { 'net/minecraft/network/datasync/EntityDataManager', '[Lnet/minecraft/client/renderer/entity/layers/LayerDeadmau5Head;' }
    stack: { 'net/minecraft/client/renderer/entity/RenderWitherSkeleton' }
  Bytecode:
    0x0000000: b803 4d4c 2bbe 0464 3d1c 9b00 192b 1c32
    0x0000010: 4e2d 2ab9 0377 0200 9900 052d b084 02ff
    0x0000020: a7ff e9b8 0351 2ab6 0378 9900 07b8 0351
    0x0000030: b001 b0                                
  Stackmap Table:
    append_frame(@9,Object[#832],Integer)
    same_frame(@29)
    chop_frame(@35,1)
    same_frame(@49)

    at java.lang.Class.getDeclaredFields0(Native Method)
    at java.lang.Class.privateGetDeclaredFields(Class.java:2575)
    at java.lang.Class.getField0(Class.java:2967)
    at java.lang.Class.getField(Class.java:1693)
    at net.minecraftforge.fml.client.FMLClientHandler.detectOptifine(FMLClientHandler.java:302)
    at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:213)
    at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:440)
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:352)
    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:483)
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

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

-- Head --
Thread: Client thread
Stacktrace:
    at java.lang.Class.getDeclaredFields0(Native Method)
    at java.lang.Class.privateGetDeclaredFields(Class.java:2575)
    at java.lang.Class.getField0(Class.java:2967)
    at java.lang.Class.getField(Class.java:1693)
    at net.minecraftforge.fml.client.FMLClientHandler.detectOptifine(FMLClientHandler.java:302)
    at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:213)
    at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:440)

-- Initialization --
Details:
Stacktrace:
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:352)
    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:483)
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
    Minecraft Version: 1.11.2
    Operating System: Windows 10 (amd64) version 10.0
    Java Version: 1.8.0_25, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 68383400 bytes (65 MB) / 255066112 bytes (243 MB) up to 1060372480 bytes (1011 MB)
    JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
    IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
    FML: 
    Loaded coremods (and transformers): 
    Launched Version: 1.11.2-forge1.11.2-13.20.0.2226
    LWJGL: 2.9.4
    OpenGL: GeForce GTX 1070/PCIe/SSE2 GL version 4.5.0 NVIDIA 378.49, 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: 
    Current Language: ~~ERROR~~ NullPointerException: null
    Profiler Position: N/A (disabled)
    CPU: 8x Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz

Edited February 5, 20178 yr by diesieben07
spoiler

I think it's because of your video card driver...

2 minutes ago, Kokkie said:

I think it's because of your video card driver...

Would I need to update, or apply a hotfix to my driver? It's updated from what I know.

There's a bug in minecraft itself, you need to downgrade...

 

Edited February 5, 20178 yr by Kokkie

Oh okay...