Re: Sims 4 crashes on startup

Well if you take the CC and mods out and the problem isn't there, and it is when you put them back in it does sound like that is the issue. 

You can find a full list of broken/incompatible CC and mods since game updated on November 13th over here:
https://forums.thesims.com/en_US/discussion/950909/broken-updated-mods-python-terrain-update-get-famous-nov-18/p1

If it doesn't work I suggest taking out half of your mods and CC and testing the game. Then keep splitting until you find all that is broken.
Either update or remove the broken CC/mods.