Sims 3 base game won't launch: 'Unknown Error Occurred'

Hello!

I'm trying to run the sims 3 on my Macbook Pro for the first time, but am running into the ever-so-popular 'Unknown Error Occurred' glitch. I got the base game to at least open up the launcher before I installed some expansion packs, but then received the error glitch after trying to run it with the EPs. So after following this video tutorial, I basically uninstalled everything and tried to reopen the launcher with just the base game after re-installing it. However, this time I can't even open the launcher and I receive the error glitch. 

Here's my Mac's Specs;

Macbook Pro (15-inch, 2017)

Processor 2.8 GHz Intel Core i7

Memory 16 GB 2133 MHz LPDDR3

Startup DIsk Macintosh HD

Graphics Radeon Pro 555 2 GB Intel HD Graphics 630 1536 MB

Any help would be greatly appreciated!