title: git pull remote branch cannot find remote ref
body: <p>I'm not sure why this doesn't work.  When I do <code>git branch -a</code>, this is what I see:</p>
  
  <p><img src="https://i.stack.imgur.com/E2Lxn.png" alt="enter image description here"></p>
  
  <p>I'm trying to pull from the DownloadManager on the online GitHub repository.  I have tried</p>
  
  <ul>
  <li>git pull, but then it complains about not knowing which branch to pull from</li>
  <li>git pull origin, doesn't know which branch</li>
  <li>git pull origin downloadmanager <code>fatal: Couldn't find remote ref downloadmanager.  Unexpected end of commands stream</code></li>
  <li>git pull origin remotes/origin/DownloadManager <code>'fatal couldn't find remote ref remotes/origin/DownloadManager.  Unexpected end of commands stream</code></li>
  </ul>
  
  <p>Is there something I'm missing?  In Xcode, When I try to connect to the repository, nothing ever shows up.  I have been able to push to it in the past.  But I can't push again until I pull the most recent changes.</p>