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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.<init>(World.java:142) at net.minecraft.server.WorldServer.<init>(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)