@abc1247333681 I've moved your post to the master thread for this error message. Please go into Documents > Electronic Arts > The Sims 3 and delete Version.tag.
@abc1247333681 Move the entire Sims 3 folder to the desktop and try again.
If that doesn't help, please open Terminal, in Applications > Utilities, copy and paste this command, and enter:
find / -name "Version.tag" 2>/dev/null
Then post the results. (Feel free to black out or delete your username, but please leave the rest intact.) I'd like to see whether there's another copy of this file lurking somewhere on your computer, and if so, where it is.
