Enable visual studio for project

Hi every one, I already made a post on answerhub but I think I have my chance here too. link => Can't open project in Visual Studio (UE from source) - UE4 AnswerHub

I just wanted to know why I can’t open my project in VS and how correct this. It’s the first time I use the source code, so maybe I just need to rebuild something or I don’t know. I have some image to explain well my problem. Thanks for futur answer !

Have a good day!