title: fatal: Unable to create '/.git/index.lock': File exists
body: <p>When I try to rename any image name in my <code>Xcode Project</code> it gives following error.</p>
  
  <blockquote>
  <pre><code>fatal: Unable to create '/.git/index.lock': File exists. 
  
  If no other git process is currently running, this probably means a
  git process crashed in this repository earlier. Make sure no other git
  process is running and remove the file manually to continue.
  </code></pre>
  </blockquote>
  
  <p>Don't know what is going wrong.
  Thanks in Advance.</p>