Can't generate VS project files

I cant open my project anymore, i get this error msg: ‘Try rebuilding from source manually’. I’m not using GitHub version, my project was created on Epic Launcher.

I have VS 2015 installed already. Went to my project file ‘name’.uproject and right-click to generate VS project files. I get this error: 'This project does not have any source code. You need to add C++ source files to the project from the Editor before you can generate project files.

I cant access the project in the beginning to add them. any idea on what to do?