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java.lang.NullPointerException: Exception while updating neighbours	at net.minecraftforge.common.BiomeDictionary.containsType(BiomeDictionary.java:440)	at net.minecraftforge.common.BiomeDictionary.isBiomeOfType(BiomeDictionary.java:261)	at com.pam.harvestcraft.worldgen.BeehiveWorldGen.generate(BeehiveWorldGen.java:25)	at net.minecraftforge.fml.common.registry.GameRegistry.generateWorld(GameRegistry.java:120)	at net.minecraft.world.chunk.Chunk.func_186034_a(Chunk.java:1001)	at net.minecraft.world.chunk.Chunk.func_186030_a(Chunk.java:974)	at net.minecraft.world.gen.ChunkProviderServer.func_186025_d(ChunkProviderServer.java:154)	at net.minecraft.world.World.func_72964_e(World.java:303)	at net.minecraft.world.World.func_175726_f(World.java:298)	at net.minecraft.world.World.func_180495_p(World.java:842)	at net.minecraft.block.BlockLiquid.func_176365_e(SourceFile:288)	at net.minecraft.block.BlockStaticLiquid.func_189540_a(BlockStaticLiquid.java:26)	at net.minecraft.block.state.BlockStateContainer$StateImplementation.func_189546_a(BlockStateContainer.java:463)	at net.minecraft.world.World.func_180496_d(World.java:519)	at net.minecraft.world.World.func_175685_c(World.java:470)	at net.minecraft.world.World.func_175722_b(World.java:423)	at net.minecraft.world.World.markAndNotifyBlock(World.java:368)	at net.minecraft.world.World.func_180501_a(World.java:349)	at net.minecraft.world.World.func_175656_a(World.java:408)	at net.minecraft.block.BlockFalling.func_176503_e(BlockFalling.java:76)	at net.minecraft.block.BlockFalling.func_180650_b(BlockFalling.java:44)	at net.minecraft.world.WorldServer.func_72955_a(WorldServer.java:744)	at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:218)	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:698)	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:387)	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)	at java.lang.Thread.run(Unknown Source)