title: Why is TFS not updating my project?
body: <p>We have an ASP.Net MVC Core project solution in TFS.</p>
  
  <p>And there is an error icon at the top of the solution explorer that says "Package restore failed".
  And if I open up the project.json I see the red sqigglies:
  "The dependency ... could not be resolved" for several dependencies.</p>
  
  <p>The developer who created this error has since fixed it.  And all the other developers on the team get latest and the error goes away.
  But it won't go away for me.
  I get latest and the error icon at the top of the solution explorer and the errors within the project.json are still there.</p>
  
  <p>I blew away the folder, got latest from Team Explorer, and the errors are still there while gone for the other errors.</p>
  
  <p>Anyone know why this is happening?
  I'm stumped.  I don't understand what is happening.</p>