title: Can't add reference in visual studio 2019
body: <p>I have recently upgraded to Visual Studio 2019, and I get a weird problem.</p>
  
  <p>When I am trying to add a reference to the project, I get an error message that says "sequence contains no elements".</p>
  
  <p>Do you know how to fix it? I have tried to reinstall, but for no avail…</p>