[CURRENT ISSUE] The Sims 3 - Disc Authorisation/No Disc Errors

I have sims 3 and a bunch of different expansion packs that have always worked until a few months ago i downloaded El Capitan onto my mac computer and now my sims won't work. It gets past the launch menu and goes all the way to the main menu before a pop up says to insert the disk which is already been inserted. Ive tried uninstalling the most recent expansion and reinstalling it but its still not working. I have also tired to launch the game through Origins but the same pop up keep accruing.