I reinstall my whole system, visual studio, and packages (control suite, crystal reports and so on), and download my solution from team foundation. When I try to rebuild it, I get missing references warning and it does not work :

[![missing references](https://i.stack.imgur.com/nUATO.png)](https://i.stack.imgur.com/nUATO.png)

When I check, all nugets package are (physically) here. The thing which annoys me the more is that even System, System.Data,... are in warning state. Anybody already had this problem (and a fix !) ?

I have a lot of project in my solution, and there's only a part of them which screw up (sorry for my english, it is not my native language).