Dimitry's Mod Conflict Detector at mod the sims is good too, ( but only for Windows not Mac) - as you may have accidentally downloaded some Sims 3 / 2 items is not always going to be an obvious thing.

I use Sims 4 Studio for batch fixes it solves a lot of problems in bulk (but not all.) It's also available for Mac.Also the EA Forums do a regular post for the broken cc.SimsVIP also do a regular post for people who use cc on which ones are broken or now updated All on the one page too, and the best list.Mods & cc are well known to cause various in-game issues please check for updates to them / where you found them do this also > after any sims update or adding a game pack.Information, Guides and Announcements for the EA app.