You're in the non-software-specific, non-support Lounge. Let us know what software you are using and a moderator can move your post to the appropriate, software-specific, support forum. As it is, we don't know if you're talking about Illustrator, Photoshop, After Effects, or something else. It sounds like it's one of the Creative Cloud programs, but for all I know, it could be a Document Cloud software!
Close your app and restart your computer.