Visual Studio Solution Unavailable (reload doesn't work)

Question

I am downloading a sample program for a barcode reader that I am using. Everytime I download the program and run it I am prompted with the error in my solution explorer (see ima

Answer 1

Right-clicking the solution and selecting (Open with VS 2013), seems to have fixed it.

Thanks all

Answer 2

Right click on the project and select reload project. In my case , i am working on a xamarin forms application using visual studio 2015. The project was not loaded initially and 2-3 times i close my IDE and later i did the above trick. This works for me.