I'm working on a small quest mod. I've created a dungeon and added some npc's. But when I go to the dungeon in game, the npc's are not there. They are visible in the Ck but not in game. Also I've setup the npc's as ghosts. Can that be the problem?

Did you add navmesh to the dungeon? http://www.creationkit.com/Bethesda_Tutorial_Navmesh

You need to create a navmesh, even if I just want them to stand there?

You need to create a navmesh ANYWHERE where NPC's are. Otherwise they don't have a darn tootin' clue where to stand, or move, or do anything.

Ok, thank you.

It worked, thanks Alexander.