Fatal error: Uncaught Error: Class "Drupal\Core\Form\ConfirmFormBase" not found in /home/fnbrshareacopy/public_html/modules/contrib/panelizer/src/Form/PanelizerDefaultDelete.php:17 Stack trace: #0 {main} thrown in /home/fnbrshareacopy/public_html/modules/contrib/panelizer/src/Form/PanelizerDefaultDelete.php on line 17