HELP:Sim stuck in floor, no cheat working

I just built a house with a foundation, and once my sims enter the house they can go anywhere they want until they stop moving. Once they stop walking they get stuck and an icon appears over there heads with footprints and an [X] (insinuating that they are stuck and cannot walk). I try the [move objects on] cheat and I can move them, but once the enter the house again as soon as they stop walking the get stuck again. I tried the [resetSim] cheat and tha does not work either, it resets them, but they are still stuck. I am assuming it has to be the way I built the house, but I cannot find anything wrong with the way I built it. The Sims moodlets say it is dark and an unfinished room, but it is not. They didnt sink into the floor, they are still standing on the floor, they just cannot move, however, when i press the go down a floor button they are still there floating above the foundation. I do not understand what happened and I've been working on this house for 3 days. Please help!!