title: Symfony 4 controllers in sub folders producing error
body: <p>Just a quick question as to why I'm getting this </p>
  
  <blockquote>
    <p>The autoloader expected class "App\Controller\Admin\AdminUnitController" to be defined in file "/home/glen/public_html/businessdirectory.glendev.local/vendor/composer/../../src/Controller/Admin/AdminUnitController.php". The file was found but the class was not in it, the class name or namespace probably has a typo in /home/glen/public_html/businessdirectory.glendev.local/config/services.yaml (which is loaded in resource "/home/glen/public_html/businessdirectory.glendev.local/config/services.yaml").</p>
  </blockquote>
  
  <p>I have AdminUnitController.php with class name AdminUnitController. All was well until I decided I want the admin controllers in their own sub folder like this:</p>
  
  <pre><code>Controller\Admin\AdminUnitController.php
  </code></pre>