Well here are some of the few options since I dont really dabble with c++
the first one is making sure your gpu is able to handle it, such as anywhere from 1080+
second thing is making sure your drivers are updated of course.
third thing is going into the project files and checking if there are any files with the same name and deleting them.
fourth thing you could do is make sure your program/software your editing with is up to date if your using a external software such as visual stuido to amend code and or change things.
fifth thing you can do is create a normal project and convert it to a c++ type to see if theres an issue with that.
sixth thing you can do is boot another pc with the c++ files on it and transfer them to your current pc and see if there is issues,
and lastly i would just reinstall the entire unreal folder with a back up on a usb in case you have important files on the current version.
Also another bit of info is are you using a version control such as git hub, git labs, or any other thing like helix core?
Theres a lot of variables to what could be wrong.
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