@superk3ll Graphics issues on newer macs range from the easily ignored to the game breaking. The fact that TS3 launches on your computer is a good sign, but you certainly should be able to play the game on higher settings. If simply adjusting them doesn't do the trick, or you want the best graphics you can get out of your mac, we can certainly help with that.
It would be useful to know what the error message says, as well as the specs of your computer. There are a couple of different MacBook Pros from last year. Here's how to find all of the relevant information:
https://answers.ea.com/t5/The-Sims-Mac/READ-FIRST-Sims-3-Mac-Help-Guides-and-Troubleshooting/m-p/4756624#M4
