Visual studio 2015 project missing all references

Question

Starting from today, a WPF project that belongs to a solution with 20 projects, set all my references to missing

I\'ve just checked the MS suggestion and the othe

Answer 1

I also experienced exactly this in VS2015 on a solution with around 10 projects. Only one project - the main MVC project - was affected and it lost all references including to the standard .NET assemblies.

The problem was in my web.config. I had commented some lines, resulting in an invalid xml-file.