Fatal error: Uncaught Error: Class "Drupal\Core\Menu\LocalActionDefault" not found in /home/www/drupal8/test/modules/webform/src/Plugin/Menu/LocalAction/WebformDialogLocalAction.php:13 Stack trace: #0 {main} thrown in /home/www/drupal8/test/modules/webform/src/Plugin/Menu/LocalAction/WebformDialogLocalAction.php on line 13