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java.lang.NullPointerException: Exception ticking world	at com.pixelmonmod.pixelmon.worldGeneration.structure.towns.ComponentTownPart.func_74875_a(ComponentTownPart.java:55)	at net.minecraft.world.gen.structure.StructureStart.func_75068_a(StructureStart.java:45)	at net.minecraft.world.gen.structure.MapGenStructure.func_175794_a(MapGenStructure.java:93)	at net.minecraft.world.gen.ChunkProviderFlat.func_73153_a(SourceFile:152)	at net.minecraft.world.gen.ChunkProviderServer.func_73153_a(ChunkProviderServer.java:269)	at net.minecraft.world.chunk.Chunk.func_76624_a(Chunk.java:1126)	at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:52)	at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:12)	at net.minecraftforge.common.util.AsynchronousExecutor.skipQueue(AsynchronousExecutor.java:344)	at net.minecraftforge.common.util.AsynchronousExecutor.getSkipQueue(AsynchronousExecutor.java:302)	at net.minecraftforge.common.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:12)	at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:117)	at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:92)	at net.minecraft.world.gen.ChunkProviderServer.func_73154_d(ChunkProviderServer.java:189)	at net.minecraft.world.World.func_72964_e(World.java:304)	at net.minecraft.world.World.func_175726_f(World.java:299)	at net.minecraft.world.World.func_180495_p(World.java:837)	at net.minecraft.block.BlockGrass.func_180650_b(BlockGrass.java:73)	at net.minecraft.block.Block.func_180645_a(Block.java:428)	at net.minecraft.world.WorldServer.func_147456_g(WorldServer.java:454)	at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:221)	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:693)	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:598)	at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:164)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:478)	at java.lang.Thread.run(Thread.java:745)