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crash report .........---- Minecraft Crash Report ----
// I bet Cylons wouldn't have this problem.

Time: 4/15/14 8:29 PM
Description: Exception in server tick loop

java.lang.NullPointerException
at net.minecraft.world.gen.structure.StructureStart.func_75068_a(StructureStart.java:47)
at net.minecraft.world.gen.structure.MapGenStructure.func_75051_a(MapGenStructure.java:81)
at net.minecraft.world.gen.ChunkProviderGenerate.func_73153_a(ChunkProviderGenerate.java:533)
at net.minecraft.world.gen.ChunkProviderServer.func_73153_a(ChunkProviderServer.java:258)
at net.minecraft.world.chunk.Chunk.func_76624_a(Chunk.java:1253)
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:153)
at net.minecraft.server.management.PlayerInstance.<init>(PlayerInstance.java:51)
at net.minecraft.server.management.PlayerManager.getOrCreateChunkWatcher(PlayerManager.java:193)
at net.minecraft.server.management.PlayerManager.func_72690_a(PlayerManager.java:183)
at net.minecraft.server.management.PlayerManager.func_72683_a(PlayerManager.java:233)
at net.minecraft.server.management.ServerConfigurationManager.func_72375_a(ServerConfigurationManager.java:220)
at net.minecraft.server.management.ServerConfigurationManager.func_72377_c(ServerConfigurationManager.java:268)
at net.minecraft.server.management.ServerConfigurationManager.func_72355_a(ServerConfigurationManager.java:136)
at net.minecraft.server.integrated.IntegratedServerListenThread.func_71747_b(IntegratedServerListenThread.java:97)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:691)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:587)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:175)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)



please help