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java.util.ConcurrentModificationException: 	at com.google.common.collect.HashBiMap$Itr.checkForConcurrentModification(HashBiMap.java:339)	at com.google.common.collect.HashBiMap$Itr.hasNext(HashBiMap.java:345)	at net.minecraft.client.audio.SoundManager.func_148605_d(SoundManager.java:212)	at net.minecraft.client.audio.SoundHandler.func_73660_a(SourceFile:179)	at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:2001)	at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:961)	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:887)	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)