Minecraft Forums

Hi,

So recently i've started playing heaps of mods, and whenever i encounter this problem I usually just stop using the mod altogether. The ButterflyMania mod is one of my favourite so i really want it to work. I have tried different versions of the mod itself; still doesn't work. Do you know how I can fix this? Here is the crash-report:

Description: Exception in server tick loop

java.lang.NullPointerException
at net.minecraft.world.gen.structure.MapGenStructure.func_143027_a(MapGenStructure.java:237)
at net.minecraft.world.gen.structure.MapGenStructure.func_75048_a(MapGenStructure.java:95)
at net.minecraft.butterflies.common.ButterflySpawnCondition.hasOverworldStrongholdAt(ButterflySpawnCondition.java:295)
at net.minecraft.butterflies.common.ButterflySpawnCondition.spawnableAt(ButterflySpawnCondition.java:192)
at net.minecraft.butterflies.common.ButterflySpawner.doButterflySpawning(ButterflySpawner.java:191)
at net.minecraft.butterflies.common.ButterflySpawner.tickStart(ButterflySpawner.java:1225)
at cpw.mods.fml.common.SingleIntervalHandler.tickStart(SingleIntervalHandler.java:28)
at cpw.mods.fml.common.FMLCommonHandler.tickStart(FMLCommonHandler.java:122)
at cpw.mods.fml.common.FMLCommonHandler.onPreServerTick(FMLCommonHandler.java:287)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:576)
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)

A detailed walkthrough of the error, its code path and all known details is as follows:
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WolfGirlHunt.