No idea ( You should *probably* report this bug to the developer(s))

[paapattaja]

2013-10-25 14:05:58 [SEVERE] [ForgeModLoader] Something real bad happened! The CraftAPI will not be running
for this Minecraft session.
You should probably report this bug to the developer(s) at https://github.com/keepcalm/BukkitForge/issues
java.lang.NullPointerException
at keepcalm.mods.bukkit.nmsforge.DimensionManagerImpl.initDimension(DimensionManagerImpl.java:195)
at net.minecraftforge.common.DimensionManager.initDimension(DimensionManager.java:68)
at net.minecraft.server.MinecraftServer.func_71218_a(MinecraftServer.java:732)
at keepcalm.mods.bukkitforge.BukkitForgeWorldCache.cacheWorld(BukkitForgeWorldCache.java:78)
at keepcalm.mods.bukkitforge.BukkitForgeWorldCache.tryGetWorld(BukkitForgeWorldCache.java:95)
at keepcalm.mods.bukkitforge.BukkitForgeWorldCache.get(BukkitForgeWorldCache.java:43)
at org.bukkit.craftbukkit.v1_5_R3.CraftServer.(CraftServer.java:198)
at keepcalm.mods.bukkit.asm.BukkitStarter.run(BukkitStarter.java:47)
at java.lang.Thread.run(Thread.java:724)