title: Project 'Projr' is not up to date. Missing output file 'c:\..\bin\Debug\Projr.dll' in VS 2017 Administrator mode
body: <p>I have been stuck with this issue from the past 2 days <strong>blank class library project</strong>;</p>
  
  <ul>
  <li>I tried restarting VS 2017 Professional edition</li>
  <li>Restarting my Machine.</li>
  <li>Reinstalled VS 2017 with the latest available update.</li>
  </ul>
  
  <p>Still facing the issue.</p>
  
  <p>Whenever we build the project it gives me the below message in the output window: no error in error list even checked the "Build Only" option in Error list - no error;
  <strong>Project 'Projr' is not up to date. Missing output file 'c:..\bin\Debug\Projr.dll'</strong></p>
  
  <p>One thing I noticed is:</p>
  
  <ul>
  <li><p>I open my VS2017 as Administrator permission(Run As Admin)- gives me this issue.</p></li>
  <li><p>But if I open without this admin option- I will be able to build my project. Since my project is a web project, I need this to be binded with IIS and virtual directory, so I need Admin mode.</p></li>
  </ul>
  
  <p>Note: the project now am trying to build(test project) is a blank class library project which is created in VS 2017 itself, <strong>this cannot be successfully built on Administrator mode</strong>.</p>
  
  <p>Can anyone help me with this issue.?</p>
  
  <p><strong>Edit1</strong>:
  From output window message in  Admin mode;</p>
  
  <p>1>Project 'Projr' is not up to date. Missing output file 'c:..\bin\Debug\Projr.dll'.
  1>------ Build started: Project: Projr, Configuration: Debug Any CPU ------
  ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========</p>
  
  <p><strong>Edit2</strong>:
  After trying this suggestion by Alexander &amp; Jeremy
  Clean the solution(<strong>This is failing for me</strong>), close solution and VS also.
  Then delete the SUO file and bin and obj folders.
  Open VS.
  Re-ref the DLL, etc, etc.. Change ref path in csproj file(s).(no special DLLs other than MS libraries. Its a blank brand new class library project.)</p>
  
  <p><strong>Edit3</strong>: Cannot build on VS2017 Admin mode but can build on developer CMD Admin mode.</p>