[12:58:12] [Server thread/ERROR]: Encountered an unexpected exception
java.lang.IllegalArgumentException: not the overworld
	at mods.immibis.chunkloader.DimensionalAnchors.getForceLoadedWorlds(DimensionalAnchors.java:210) ~[DimensionalAnchors.class:?]
	at mods.immibis.chunkloader.DimensionalAnchors.loadForcedWorlds(DimensionalAnchors.java:222) ~[DimensionalAnchors.class:?]
	at mods.immibis.chunkloader.DimensionalAnchors.onTickInGame(DimensionalAnchors.java:552) ~[DimensionalAnchors.class:?]
	at mods.immibis.core.api.porting.PortableBaseMod$TickEventServerHandler.tickEventServer(PortableBaseMod.java:13) ~[PortableBaseMod$TickEventServerHandler.class:?]
	at cpw.mods.fml.common.eventhandler.ASMEventHandler_561_TickEventServerHandler_tickEventServer_ServerTickEvent.invoke(.dynamic) ~[?:?]
	at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54) ~[ASMEventHandler.class:1.7.10-1614.57]
	at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:140) ~[EventBus.class:1.7.10-1614.57]
	at cpw.mods.fml.common.FMLCommonHandler.onPreServerTick(FMLCommonHandler.java:264) ~[FMLCommonHandler.class:1.7.10-1614.57]
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:829) ~[MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:693) [MinecraftServer.class:?]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_45-internal]