Hi this happened to me. Logging out of origin and restarting my mac then logging back in worked, although I'm assuming you might have already tried that. Also try going in to Finder>Documents>EA>Sims 3> and delete the file called Version.tag then relaunching origin.
@EmmaVD Please start a new thread for that issue; this one is for the specific error you were seeing. Please also attach your deviceconfig.log to the post; it's in Documents > Electronic Arts > The Sims 3. (You'll need to manually open the folders; the file won't show up in a search.) You can delete your user and computer names, about 25 lines down, but there's nothing else in that file that can identify you.
