Need terrain control/multiverse help

Pardon me but may I ask what I am doing wrong or what is conflicting here.I have looked at the bukkit page for terrain control failing to install it on my servers first world I downloaded the new version of multiverse2-core and type what it told me to do to create a world with terrain control (/mv create myworldsname -g TerrainControl) however it says in chat that a internal server error occurred and when I check console I get the following error (the pluses are not part of the error but the border separating this message from the error log.)

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2012-05-11 07:35:42 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'mv' in plugin Multiverse-Core v2.3-AB
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:42)
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:166)
at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:473)
at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:821)
at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:781)
at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:764)
at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:34)
at net.minecraft.server.NetworkManager.b(NetworkManager.java:229)
at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:113)
at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:78)
at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:551)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:449)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
Caused by: java.lang.NullPointerException
at com.onarandombox.MultiverseCore.MultiverseCore.onCommand(MultiverseCore.java:474)
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:40)
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++I am not sure if a plugin I have conflicts or if im just being derpy.