Cats and dogs not working

Ive had the cats and dogs expansion pack for several weeks, it was working just fine this morning and suddenly it stopped working, its installed, but when i go onto my game it says i cannot use the world, and its only in my library. ive reinstalled all of my expansion packs (which have no issues) and repaired everything too, deleted all cc and mods, tried to restart the games cache, and it still wont let me use cats and dogs even when it is installed