Reecyy

I have reached a dilemma, my server for two people was operating fine until we decided to go into the Nether :/ I have included the crash report, it would be much appreciated if somebody could help me. 2014-03-13 09:32:38 [sEVERE] [Minecraft-Server] Encountered an unexpected exception NullPointerException 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:130) at net.minecraftforge.event.ASMEventHandler_29_EventHookContainer_onWorldLoad_Load.invoke(.dynamic) at net.minecraftforge.event.ASMEventHandler.invoke(ASMEventHandler.java:39) at net.minecraftforge.event.EventBus.post(EventBus.java:108) 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) at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)