Sims 4 No Longer Working

Here is the error message I receive when I try to open the app: 

/Users/MyName/Applications/The Sims 4.app/Contents/Frameworks/ActivationUI.app/Contents/MacOS/ActivationUI

I am somewhat computer illiterate and I haven't tried to open this app in years, but now I want to play and I'm annoyed that I payed for something I can't use. Help would be appreciated.. especially if I don't have to uninstall my current MacOS.