java.lang.NullPointerException: Exception in server tick loop

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java.lang.NullPointerException: Exception in server tick loop
at rtg.event.EventManagerRTG.onGetVillageBlockID(EventManagerRTG.java:193)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_337_EventManagerRTG_onGetVillageBlockID_GetVillageBlockID.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
at net.minecraft.world.gen.structure.StructureVillagePieces$Village.func_151558_b(StructureVillagePieces.java:1630)
at net.minecraft.world.gen.structure.StructureVillagePieces$Village.func_151549_a(StructureVillagePieces.java:1703)
at net.minecraft.world.gen.structure.StructureVillagePieces$Well.func_74875_a(StructureVillagePieces.java:1762)
at net.minecraft.world.gen.structure.StructureStart.func_75068_a(StructureStart.java:44)
at net.minecraft.world.gen.structure.MapGenStructure.func_75051_a(MapGenStructure.java:93)
at com.xcompwiz.mystcraft.symbol.symbols.SymbolVillages$Populator.populate(SymbolVillages.java:42)
at com.xcompwiz.mystcraft.world.AgeController.populate(AgeController.java:572)
at com.xcompwiz.mystcraft.world.ChunkProviderMyst.func_73153_a(ChunkProviderMyst.java:169)
at net.minecraft.world.gen.ChunkProviderServer.func_73153_a(ChunkProviderServer.java:279)
at net.minecraft.world.chunk.Chunk.func_76624_a(Chunk.java:1055)
at com.xcompwiz.mystcraft.world.profiling.WorldProviderMystDummy$ChunkProviderServerDummy.originalLoadChunk(WorldProviderMystDummy.java:62)
at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:131)
at com.xcompwiz.mystcraft.world.profiling.WorldProviderMystDummy.generateNextChunk(WorldProviderMystDummy.java:217)
at com.xcompwiz.mystcraft.world.profiling.InstabilityDataCalculator.stepChunkGeneration(InstabilityDataCalculator.java:343)
at com.xcompwiz.mystcraft.world.profiling.InstabilityDataCalculator.onServerTick(InstabilityDataCalculator.java:180)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_559_InstabilityDataCalculator_onServerTick_ServerTickEvent.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:140)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:590)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:396)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

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