title: Project 'Default' not found error when installing a NuGet package
body: <p>I copied the <a href="https://docs.efproject.net/en/latest/platforms/aspnetcore/new-db.html" rel="noreferrer">following project</a> from win 8.1 to windows 7 and deleted the Migration folder. Now when I run <code>PM&gt; Add-Migration MyFirstMigration -context BloggingContext</code> command in VS2015 I get the error: <code>Project &quot;Default&quot; is not found</code>. Both the machines have ASP.NET Core 1.0 and VS2015-Update 3 installed. I get the same error if I run <code>Install-Package</code> command for any package. Project runs fine on Win8.1</p>
  <p><strong>UPDATE</strong></p>
  <p>I do not have the same issue when copying a project from Windows 7 to Windows 8.1 or after I upgraded from windows 7 to Windows 10. Maybe, the above issue has something to do with copying a project from a higher version to lower version</p>