Had this issue myself which directed me to this thread.
In my case it was pretty simple to solve. For me, the issue was that the project was looking at the D-drive whereas my project currently exists on my E-drive. I could simply open the Properties of the project from Visual Studio by right-clicking, navigate to Debugging, and in the Command Arguments, I saw it was looking for the uproject on the D-drive. I simply had to change this to the E-drive.
Problem solved for me 