java.lang.NullPointerException
    at nightkosh.gravestone.tileentity.TileEntityGraveStone.setSpawnerHelper(TileEntityGraveStone.java:258)
    at nightkosh.gravestone_extended.structures.GraveGenerationHelper.placeGrave(GraveGenerationHelper.java:73)
    at nightkosh.gravestone_extended.structures.GraveGenerationHelper.placeGrave(GraveGenerationHelper.java:63)
    at nightkosh.gravestone_extended.structures.GraveGenerationHelper.placeGrave(GraveGenerationHelper.java:54)
    at nightkosh.gravestone_extended.structures.GraveGenerationHelper.placeGrave(GraveGenerationHelper.java:49)
    at nightkosh.gravestone_extended.structures.graves.ComponentSingleGrave.addComponentParts(ComponentSingleGrave.java:40)
    at nightkosh.gravestone_extended.structures.graves.SingleGraveGenerator.generate(SingleGraveGenerator.java:38)
    at nightkosh.gravestone_extended.structures.GraveStoneWorldGenerator.generateSurface(GraveStoneWorldGenerator.java:41)
    at nightkosh.gravestone_extended.structures.GraveStoneWorldGenerator.generate(GraveStoneWorldGenerator.java:31)
    at net.minecraftforge.fml.common.registry.GameRegistry.generateWorld(GameRegistry.java:167)
    at net.minecraft.world.chunk.Chunk.populate(Chunk.java:1018)
    at net.minecraft.world.chunk.Chunk.populate(Chunk.java:988)
    at net.minecraft.world.gen.ChunkProviderServer.provideChunk(ChunkProviderServer.java:157)
    at net.minecraft.server.management.PlayerChunkMapEntry.providePlayerChunk(PlayerChunkMapEntry.java:126)
    at net.minecraft.server.management.PlayerChunkMap.tick(SourceFile:147)
    at net.minecraft.world.WorldServer.tick(WorldServer.java:227)
    at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:756)
    at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:668)
    at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:185)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526)
    at java.lang.Thread.run(Unknown Source)