java.util.concurrent.ExecutionException: java.lang.NullPointerException

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java.lang.NullPointerException
java.util.concurrent.ExecutionException: java.lang.NullPointerException
at mcjty.rftoolsdim.dimensions.RfToolsDimensionManager.getDimensionManager(RfToolsDimensionManager.java:296)
at mcjty.rftoolsdim.dimensions.world.GenericWorldProvider.getDimensionInformation(GenericWorldProvider.java:66)
at mcjty.rftoolsdim.dimensions.world.GenericWorldProvider.func_76572_b(GenericWorldProvider.java:163)
at net.minecraft.client.network.NetHandlerPlayClient.func_147282_a(NetHandlerPlayClient.java:249)
at net.minecraft.network.play.server.S01PacketJoinGame.func_148833_a(SourceFile:76)
at net.minecraft.network.play.server.S01PacketJoinGame.func_148833_a(SourceFile:13)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at net.minecraft.util.Util.func_181617_a(SourceFile:44)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1014)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:349)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:310)
at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:395)
at org.multimc.EntryPoint.listen(EntryPoint.java:170)
at org.multimc.EntryPoint.main(EntryPoint.java:54)

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