PSA: Sims 4 "Failed to launch game - An error on our end" -> Check Your Mods!

Sims 4 has failed to launch for some weeks now. I've uninstalled and redownloaded multiple times, repaired multiple times, as well as moved folders around and nothing seems to have worked.  I've attached the error message I get when I try to launch. 

edited title for visibility.  -puzzlezaddict

CM title edit