I NEED HELP! PLEASE!

Ok, Well to start off I am making a Hexxit server (1.5.2) and I have the plugin Multiverse and the world I had my spawn in got corrupted so I made a new world (in game using multiverse) so I created it.. Made a spot to copy and paste the spawn over so I copied the spawn over to the new world and it's fine.. Well, when I delete the other corrupted world that world no longer works.. I have tried deleting all the worlds and just adding in the new world but it doesn't seem to work.. It only work when I have the corrupted world.. I know its a bit confusing but can some one help me?