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I am trying to set up forge but it keeps crashing. I dont know what is wrong. Please help

---- Minecraft Crash Report ----

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

// Would you like a cupcake?

Time: 6/4/16 12:10 PM
Description: Initializing game

java.lang.VerifyError: Inconsistent stackmap frames at branch target 21
Exception Details:
Location:
Config.getWorldServer()Lnet/minecraft/world/WorldManager; @21: getstatic
Reason:
Type 'net/minecraft/client/network/NetHandlerPlayClient' (current frame, locals[0]) is not assignable to 'net/minecraft/world/World' (stack map, locals[0])
Current Frame:
bci: @16
flags: { }
locals: { 'net/minecraft/client/network/NetHandlerPlayClient' }
stack: { 'net/minecraft/client/network/NetHandlerPlayClient' }
Stackmap Frame:
bci: @21
flags: { }
locals: { 'net/minecraft/world/World' }
stack: { }
Bytecode:
0x0000000: b200 75c7 0005 01b0 b200 75b4 0523 4b2a
0x0000010: c700 0501 b0b2 0075 b605 279a 0005 01b0
0x0000020: b200 75b6 052a 4c2b c700 0501 b02a b405
0x0000030: 304d 2cc7 0005 01b0 2cb6 0536 4e2b 2db6
0x0000040: 053b b605 3e3a 0419 04b0 3a04 01b0
Exception Handler Table:
bci [61, 73] => handler: 74
Stackmap Table:
same_frame(@8)
append_frame(@21,Object[#1317])
same_frame(@32)
append_frame(@45,Object[#1324])
append_frame(@56,Object[#1330])
full_frame(@74,{Object[#1317],Object[#1324],Object[#1330],Object[#1336]},{Object[#1312]})

at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Class.java:2583)
at java.lang.Class.getField0(Class.java:2975)
at java.lang.Class.getField(Class.java:1701)
at net.minecraftforge.fml.client.FMLClientHandler.detectOptifine(FMLClientHandler.java:274)
at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:190)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:434)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:346)
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:498)
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 --
Stacktrace:
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Class.java:2583)
at java.lang.Class.getField0(Class.java:2975)
at java.lang.Class.getField(Class.java:1701)
at net.minecraftforge.fml.client.FMLClientHandler.detectOptifine(FMLClientHandler.java:274)
at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:190)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:434)

-- Initialization --
Details:
Stacktrace:
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:346)
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:498)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.9
Operating System: Linux (amd64) version 3.19.0-59-generic
Java Version: 1.8.0_91, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 30514008 bytes (29 MB) / 221126656 bytes (210 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 5 total; -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML:
Loaded coremods (and transformers):
Launched Version: 1.9-forge1.9-12.16.0.1809-1.9
LWJGL: 2.9.4
OpenGL: Gallium 0.4 on AMD REDWOOD GL version 3.0 Mesa 10.3.2, X.Org
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: No
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: 4x Intel(R) Core(TM) i5 CPU M 580 @ 2.67GHz