I've been getting this too a lot of late, but in my case I'm pretty sure it's related to removed CC that I likely used but forgot about. Also, if you have mods that have had recent updates - I've seen a number of mods that don't document all of their changes...
That noted, stuff is very often placed on the gallery that requires CC that it fails to listen, and if you grab such an item you will get this popup everytime you use / visit that gallery item until you actually go into it with edit mode and resave it.