title: Couldn't communicate with a helper application
body: <p>I upgraded my OSX to macOS Big Sur version 11.1. Ever since I got this problem when trying to sign in in Xcode:</p>
  <p><a href="https://i.stack.imgur.com/3vKry.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/3vKry.png" alt="enter image description here" /></a></p>
  <p>at the time I had an earlier version of xcode (12.2). I upgraded to Xcode 12.3 and the problem disappeared but then I came back up again. What can I do to fix this?</p>
  <h1>What I tried</h1>
  <ul>
  <li>rebooting in safe mode, didn't help</li>
  <li>upgrading Xcode, solved the problem temporarily</li>
  <li>tried to rebuild the dynamic link editor cache as suggested <a href="https://discussions.apple.com/thread/251084960?answerId=251084960021#251084960021" rel="nofollow noreferrer">here</a> but it was a dead end:</li>
  </ul>
  <pre><code>sudo update_dyld_shared_cache –force 
  This tool is deprecated.
  </code></pre>