he has got a probleme with autocraft and gregtech tools,a hammer sound is played continuously during the preparation of the craft and sometimes the game crash with this error:

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:2013)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:973)
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(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)

someone have the same problem than me or have an idea to fix this problem ?

I do not think we can prevent the sound from playing since it is injected into the crafting process on his side.

okay, thank you for your response :)