title: Can't add file to TFS because "cannot lock item" of parent folder
body: <p>I'm trying to add a file to TFS. When I right click on the file and choose "TFS > Add", I receive this message (which has my name in it):</p>
  
  <blockquote>
    <p>TF10151: Cannot lock item $/Blah/API Code/packages/folder/file.dll for check-out. The item $/Blah/API Code/packages is checked out by Hoppe, Joseph in Workspace XYZ.</p>
  </blockquote>
  
  <p>If I look in Source Control Explorer, it reports that the packages folder has a pending change of add, although there are other files checked in underneath of it. </p>
  
  <p>If I right click and do TFS undo, it reports "There are no changes to undo in the selection or any children of the selection".</p>
  
  <p>If I try TF undo, I get the following error:</p>
  
  <pre><code>tf undo /workspace:XYZ;Domain\MyDomainAccount $/Blah/API Code/packages/folder/file.dll /server:http://domain:8080/tfs
  No pending changes to undo.                                                       
  </code></pre>
  
  <p>If I try tf undo * /recursive, I also receive the same message.</p>
  
  <p>I deleted the folder. I then re-got it from TFS. Same issue.</p>
  
  <p>How can I add these files to TFS?  I looked in Source Control Explorer in VS2013 and VS2015.</p>
  
  <p>Can these be locked from before my computer was formatted? If so, how do I unlock it?</p>