What type of project is this, and was it upgraded from a previous engine version?
If so, go into your Unreal Projects folder and delete your Saved, Intermediate, and Config files/folders. New ones will be created when you re-open the project. I would make a copy of those files/folders first though.
Unless we have a way to reproduce this issue, there is not much in the way of reporting this as a bug. Let me know if you have additional questions.
Thanks,