TF

-- Minecraft Crash Report ----
// Don't be sad, have a hug! <3

Time: 4/13/16 9:31 PM
Description: Unexpected error

java.util.ConcurrentModificationException
	at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
	at java.util.ArrayList$Itr.next(Unknown Source)
	at fastcraft.ak.a(F:121)
	at fastcraft.ak.a(F:471)
	at fastcraft.HC.al(F:50)
	at net.minecraft.client.renderer.RenderGlobal.func_147589_a(RenderGlobal.java)
	at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1224)
	at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1011)
	at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1001)
	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:898)
	at net.minecraft.client.main.Main.main(SourceFile:148)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	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:
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-- Head --
Stacktrace:
	at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
	at java.util.ArrayList$Itr.next(Unknown Source)
	at fastcraft.ak.a(F:121)
	at fastcraft.ak.a(F:471)
	at fastcraft.HC.al(F:50)
	at net.minecraft.client.renderer.RenderGlobal.func_147589_a(RenderGlobal.java)
	at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1224)
	at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1011)