SimsManiacIGuess Are you trying to launch Sims 4 through the EA App library or through its desktop shortcut? The Origin error is old and hasn't been replaced yet, but it's entirely possible that the underlying issue is the same: the game is trying to open and not detecting the launcher.
Point is, make sure the EA App is open and fully loaded, then launch Sims 4 from within your library.
If that doesn't work, clear the EA App's cache:
https://help.ea.com/en-us/help/faq/clear-cache-to-fix-problems-with-your-games/
Uninstall the App, restart your computer, download a fresh copy of the installer, and run it as an admin: right-click the download and select "Run as administrator." Then try to launch Sims 4 again.
