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java.util.ConcurrentModificationException: 	at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)	at java.util.HashMap$KeyIterator.next(HashMap.java:1453)	at net.minecraft.util.ClassInheritanceMultiMap.(SourceFile:23)	at net.minecraft.world.chunk.Chunk.(Chunk.java:83)	at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75823_a(AnvilChunkLoader.java:408)	at net.minecraft.world.chunk.storage.AnvilChunkLoader.checkedReadChunkFromNBT__Async(AnvilChunkLoader.java:122)	at net.minecraft.world.chunk.storage.AnvilChunkLoader.loadChunk__Async(AnvilChunkLoader.java:95)	at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage1(ChunkIOProvider.java:20)	at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage1(ChunkIOProvider.java:12)	at net.minecraftforge.common.util.AsynchronousExecutor$Task.init(AsynchronousExecutor.java:151)	at net.minecraftforge.common.util.AsynchronousExecutor$Task.initAsync(AsynchronousExecutor.java:96)	at net.minecraftforge.common.util.AsynchronousExecutor$Task.run(AsynchronousExecutor.java:86)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)