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java.lang.NullPointerException: Exception getting block type in world	at wandi.mrtooth.StructureGenerator.generateSphere(StructureGenerator.java:125)	at wandi.mrtooth.StructureGenerator.generate(StructureGenerator.java:92)	at cpw.mods.fml.common.registry.GameRegistry.generateWorld(GameRegistry.java:106)	at net.minecraft.world.gen.ChunkProviderServer.func_73153_a(ChunkProviderServer.java:280)	at net.minecraft.world.chunk.Chunk.func_76624_a(Chunk.java:1055)	at net.minecraft.world.gen.ChunkProviderServer.originalLoadChunk(ChunkProviderServer.java:190)	at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:131)	at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:101)	at net.minecraft.world.gen.ChunkProviderServer.func_73154_d(ChunkProviderServer.java:199)	at net.minecraft.world.World.func_72964_e(World.java:419)	at net.minecraft.world.World.func_147439_a(World.java:345)	at net.minecraft.world.World.func_147437_c(World.java:365)	at net.minecraft.world.World.func_147474_b(World.java:329)	at net.minecraft.world.WorldProvider.func_76566_a(WorldProvider.java:71)	at net.minecraft.world.WorldServer.func_73052_b(WorldServer.java:749)	at net.minecraft.world.WorldServer.func_72963_a(WorldServer.java:715)	at net.minecraft.world.World.(World.java:260)	at net.minecraft.world.WorldServer.(WorldServer.java:97)	at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:62)	at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:92)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:387)	at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)