title: fatal error for pushing file to github
body: <p>I would like to transfer a local repo to another repo already located in github.
  I did :
  git clone http:xxxxxx --> files transfered
  At the repo, i created a folder with one file</p>
  
  <pre><code>$ git add .
  $ git commit -m "xxx"
  $ git push (or git push origin master)
  </code></pre>
  
  <p>Here is the message on my terminal :
  <a href="https://i.stack.imgur.com/ArLfA.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ArLfA.png" alt="enter image description here"></a></p>
  
  <p>Could you help me ?</p>