Fatal error: Uncaught Error: Class "Drupal\Core\Menu\LocalActionDefault" not found in /home/www/drupal8/test/core/modules/menu_ui/src/Plugin/Menu/LocalAction/MenuLinkAdd.php:14 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/menu_ui/src/Plugin/Menu/LocalAction/MenuLinkAdd.php on line 14