java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at StevenDimDoors.mod_pocketDim.saving.DDSaveHandler.verifyParents(DDSaveHandler.java:167)
at StevenDimDoors.mod_pocketDim.saving.DDSaveHandler.unpackDimData(DDSaveHandler.java:97)
at StevenDimDoors.mod_pocketDim.saving.DDSaveHandler.loadAll(DDSaveHandler.java:82)
at StevenDimDoors.mod_pocketDim.core.PocketManager.loadInternal(PocketManager.java:436)
at StevenDimDoors.mod_pocketDim.core.PocketManager.load(PocketManager.java:263)
at StevenDimDoors.mod_pocketDim.EventHookContainer.onWorldLoad(EventHookContainer.java:133)
at net.minecraftforge.event.ASMEventHandler_26_EventHookContainer_onWorldLoad_Load.invoke(.dynamic)
at net.minecraftforge.event.ASMEventHandler.invoke(ASMEventHandler.java:39)
at net.minecraft.server.MinecraftServer.func_71247_a(MinecraftServer.java:259)
at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:187)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:445)

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