title: Git push failure (Github/RStudio)
body: <p>I've used Git successfully on this machine in the past but suddenly I can no longer push my commits to the Github repo. The last change to the Git toolchain that I made was to install Git 1.8.5.2, in addition to the Github for Windows client. RStudio could not find Git unless I'd already started the Github client so I decided to simply install a stand-alone Git client and change the RStudio Git path.</p>
  
  <h2>Error message (RStudio):</h2>
  
  <blockquote>
    <p>error: cannot spawn rpostback-askpass: No such file or directory</p>
    
    <p>fatal: could not read Username for '<a href="https://github.com" rel="noreferrer">https://github.com</a>': No such file or directory</p>
  </blockquote>
  
  <h2>Troubleshooting:</h2>
  
  <ol>
  <li>I can commit all projects.</li>
  <li>I can pull new projects.</li>
  <li>I cannot push any projects, I receive the same error message every time.</li>
  <li>I cannot push with Github or RStudio.</li>
  <li>Reinstalling /uninstalling Git / Github does not resolve the issue.</li>
  </ol>
  
  <h2>Setup:</h2>
  
  <p>This is an R project, with RStudio as my IDE / Git GUI. </p>
  
  <p>I'm using Git 1.8.5.2 for Windows 7.</p>
  
  <p>Let me know if there's any more information that you need.</p>
  
  <h2>Update 1:</h2>
  
  <p>Git GUI tells me that:</p>
  
  <blockquote>
    <p>Error: hook execution requires sh (not in PATH).</p>
  </blockquote>
  
  <p>Let's see if I can fix that...</p>