>
18:31:39 [SEVERE] java.util.ConcurrentModificationException
>
18:31:39 [SEVERE]       at java.util.HashMap$HashIterator.nextEntry(HashMap.java:839)
>
18:31:39 [SEVERE]       at java.util.HashMap$ValueIterator.next(HashMap.java:868)
>
18:31:39 [SEVERE]       at net.minecraft.nbt.NBTTagCompound.func_74734_a(NBTTagCompound.java:40)
>
18:31:39 [SEVERE]       at net.minecraft.nbt.NBTBase.func_74731_a(NBTBase.java:117)
>
18:31:39 [SEVERE]       at net.minecraft.nbt.CompressedStreamTools.func_74800_a(CompressedStreamTools.java:140)
>
18:31:39 [SEVERE]       at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75821_a(AnvilChunkLoader.java:303)
>
18:31:39 [SEVERE]       at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75814_c(AnvilChunkLoader.java:289)
>
18:31:39 [SEVERE]       at net.minecraft.world.storage.ThreadedFileIOBase.func_75736_b(ThreadedFileIOBase.java:39)
>
18:31:39 [SEVERE]       at net.minecraft.world.storage.ThreadedFileIOBase.run(ThreadedFileIOBase.java:27)
>
18:31:39 [SEVERE]       at java.lang.Thread.run(Thread.java:724)