title: Github desktop "error: cannot lock ref 'refs/remotes/origin/master': unable to resolve reference' (
body: <p><a href="https://i.stack.imgur.com/9tg8h.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9tg8h.png" alt="enter image description here"></a></p>
  
  <p>I suddenly, after committing my changed files, could not click on 'push', instead it said: "publish branch" (see image). So when I tried push that button ("publish branch"), I got the error as seen in the image. </p>
  
  <p>I have not done anything unusual, other than just committing changed files and pushing them. What is this happening, and how can I fix it?</p>