Error

 java.lang.RuntimeException: Could not create Instability Comparison Dimension
at com.xcompwiz.mystcraft.world.InstabilityDataCalculator.stepChunkGeneration(InstabilityDataCalculator.java:247)
at com.xcompwiz.mystcraft.world.InstabilityDataCalculator.onServerTick(InstabilityDataCalculator.java:111)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_797_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:138)
at cpw.mods.fml.common.FMLCommonHandler.onPostServerTick(FMLCommonHandler.java:252)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:851)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:658)
at java.lang.Thread.run(Unknown Source)