Fatal error: Uncaught Error: Class "Drupal\Component\Plugin\Derivative\DeriverBase" not found in /home/fnbrshareacopy/public_html/modules/contrib/panelizer/src/Plugin/AddDefaultLinkDeriver.php:12 Stack trace: #0 {main} thrown in /home/fnbrshareacopy/public_html/modules/contrib/panelizer/src/Plugin/AddDefaultLinkDeriver.php on line 12