User blog:Bunnyboo50/HELP! Error on The Sims 3

Hi there, I need help with an error. When I was about to play with my usual family on The Sims 3 (with Pets and Generations), I found a strange iron on my family and when I tried to play it here's what I read: It says ‘a serious error occurred while loading ‘x.sims3′. we strongly recommend that you restart the application’.

I need HELP!

Is there anyone on here who's ever experienced the error and that they can help me fix it? I would be really grateful if someone did :)