No sims in my game

I just started playing my game again but I kept getting "error sism4 already running". I was able to get the game to work by making a new account on my computer but then when i loaded up the game there are absolutely no sims in my game. I created a sim and put her on a lot and it said error restart game and after that I have no sim. She's not at her lot, there are no base game sims assigned lots. I can't even travel because I don't have any sims. Does anyone know how to fix this issue?