Somehow broke my game.

So, the other day, I downloaded some new mods + cc and after, I started having issues where I can’t actually play the game besides CAS. When I try to select a household/sim and hit play, it takes me back to the world select screen and usually has a weird blue box (pic included) on the bottom left. When I try to add a lot from the gallery I get the error message in the pic and it changes the name of the lot but it remains the previous lot (pic included). It’s been 3 days of going through and removing all the mods and cc I downloaded and nothing is working, and I’m genuinely going insane, I just want to play the game 😭. Any help would be greatly appreciated.