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java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)[Chunk I/O Executor Thread-1/INFO] at java.util.HashMap$KeyIterator.next(HashMap.java:1453)[Chunk I/O Executor Thread-1/INFO] at net.minecraft.util.ClassInheritanceMultiMap.<init>(SourceFile:26)[Chunk I/O Executor Thread-1/INFO] at net.minecraft.world.chunk.Chunk.<init>(Chunk.java:88)[Chunk I/O Executor Thread-1/INFO] at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75823_a(AnvilChunkLoader.java:433)[Chunk I/O Executor Thread-1/INFO] at net.minecraft.world.chunk.storage.AnvilChunkLoader.checkedReadChunkFromNBT__Async(AnvilChunkLoader.java:139)[Chunk I/O Executor Thread-1/INFO] at net.minecraft.world.chunk.storage.AnvilChunkLoader.loadChunk__Async(AnvilChunkLoader.java:104)[Chunk I/O Executor Thread-1/INFO] at net.minecraftforge.common.chunkio.ChunkIOProvider.run(ChunkIOProvider.java:68)[Chunk I/O Executor Thread-1/INFO] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[Chunk I/O Executor Thread-1/INFO] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[Chunk I/O Executor Thread-1/INFO] at java.lang.Thread.run(Thread.java:745)