CAS loading forever

One big issue that I am having is CAS, when I go into my game and click "New Game" the screen turns white and stays there forever (I have tried to let it load for over an hour.) The same thing happens if I click modify in CAS on sims in a save file I have already played. I do use mods and custom content so I took those out to see if it could solve the issue but when I do that I can go into CAS by clicking new game but I can no longer access my families in my already made save files. I don't know what to do!