java.lang.NullPointerException

java.lang.NullPointerException: Exception ticking world
	at net.minecraftforge.common.BiomeDictionary.containsType(BiomeDictionary.java:440)
	at net.minecraftforge.common.BiomeDictionary.isBiomeOfType(BiomeDictionary.java:261)
	at ic2.core.Ic2WorldDecorator.genRubberTree(Ic2WorldDecorator.java:276)
	at ic2.core.Ic2WorldDecorator.generate(Ic2WorldDecorator.java:235)
	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.server.management.PlayerChunkMapEntry.func_187268_a(PlayerChunkMapEntry.java:126)
	at net.minecraft.server.management.PlayerChunkMap.func_72693_b(SourceFile:147)

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