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java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)[?:1.8.0_45-internal] at java.util.HashMap$KeyIterator.next(HashMap.java:1453)[?:1.8.0_45-internal] at net.minecraft.util.ClassInheritanceMultiMap.<init>(SourceFile:23)[ne.class:?] at net.minecraft.world.chunk.Chunk.<init>(Chunk.java:83)[amy.class:?] at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75823_a(AnvilChunkLoader.java:408)[anj.class:?] at net.minecraft.world.chunk.storage.AnvilChunkLoader.checkedReadChunkFromNBT__Async(AnvilChunkLoader.java:122)[anj.class:?] at net.minecraft.world.chunk.storage.AnvilChunkLoader.loadChunk__Async(AnvilChunkLoader.java:95)[anj.class:?] at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage1(ChunkIOProvider.java:20)[ChunkIOProvider.class:?] at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage1(ChunkIOProvider.java:12)[ChunkIOProvider.class:?] at net.minecraftforge.common.util.AsynchronousExecutor$Task.init(AsynchronousExecutor.java:151)[AsynchronousExecutor$Task.class:?] at net.minecraftforge.common.util.AsynchronousExecutor$Task.initAsync(AsynchronousExecutor.java:96)[AsynchronousExecutor$Task.class:?] at net.minecraftforge.common.util.AsynchronousExecutor$Task.run(AsynchronousExecutor.java:86)[AsynchronousExecutor$Task.class:?] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[?:1.8.0_45-internal] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[?:1.8.0_45-internal] at java.lang.Thread.run(Thread.java:745)[?:1.8.0_45-internal]