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java.lang.NullPointerException: 	at net.minecraft.server.WorldServer.c(WorldServer.java:106)	at net.minecraft.server.World.a(World.java:2063)	at net.minecraft.server.Chunk.addEntities(Chunk.java:470)	at net.minecraft.server.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:79)	at net.minecraft.server.ChunkProviderServer.getOrCreateChunk(ChunkProviderServer.java:118)	at net.minecraft.server.World.getChunkAt(World.java:274)	at net.minecraft.server.World.getTypeId(World.java:221)	at net.minecraft.server.World.isEmpty(World.java:225)	at net.minecraft.server.World.a(World.java:192)	at net.minecraft.server.WorldProvider.canSpawn(SourceFile:51)	at net.minecraft.server.World.canSpawn(World.java:97)	at net.minecraft.server.World.c(World.java:180)	at net.minecraft.server.World.(World.java:142)	at net.minecraft.server.WorldServer.(WorldServer.java:27)	at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:180)	at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:148)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:335)	at net.minecraft.server.ThreadServerApplication.run(SourceFile:422)