Re: Error : 6d1778b8:1df4e8dc:00000000:912c9c10

@AngelSparkles00  Please clear Origin's cache:

https://help.ea.com/en/help/faq/clear-cache-to-fix-problems-with-your-games/

restart your computer, and repair again.  I'm not sure from your description whether the repair went through, so if it's not working, please let me know what exactly happens when you try to repair.

If you can repair, and Origin completes the job (you'll see progress in the lower-left corner of the Origin window), but you still can't play, please move the entire Sims 4 folder out of Documents\Electronic Arts and onto your desktop, then try again to play.  If the game launches, a clean folder will spawn with no content.  Your saves and other user content won't be available, but the files themselves will be intact, and you can transfer them over later.

If that doesn't help either, please run a dxdiag and attach it to a post.

https://help.ea.com/en/help/pc/how-to-gather-dxdiag-information/