VS 2019 [RESOLVED] Can't find app.EXE when running project?? (can't generate the bin/debug/app.EXE ??)

Getting a weird error when I run/F5 a project.
It seems like it can't generate the bin/debug/app.EXE file and then it errors out saying it can't run the app.EXE file.

Anyone know what causes this? Seems to be some kind of file/folder permission ?

When I create a new project, and run it, I get no error, so it seems project specific.