title: Backpack Permissionmanager not getting install
body: <p>I am using Laravel Backpack and trying to setup roles and permissions in it.
  Command I am using is:</p>
  <pre><code>composer require backpack/permissionmanager
  </code></pre>
  <p>It is throwing this error again and again:</p>
  <p><a href="https://i.stack.imgur.com/J8MJc.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/J8MJc.png" alt="enter image description here" /></a></p>
  <p>Can anyone know why is it so? What else I could do to get it installed?</p>