I had something similar happen to me, my sim was trying to return home and I got the serious error has occured, this was the first time I've seen the error on my of my games (I currently have 3-each in a different world) that I'm playing, so I started a new one with a new family and got the error, I wasn't too far into it, so I just uninstalled and re-installed that world and started my family over again, so far so good, but it did shut down on my after 3 hours of playing (not that error though) right after I just saved it, so I will check it again tonight when I get home.