Fatal error: Uncaught Error: Interface "Drupal\Core\Entity\ContentEntityInterface" not found in /home/www/drupal8/test/core/modules/menu_link_content/src/MenuLinkContentInterface.php:12 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/menu_link_content/src/MenuLinkContentInterface.php on line 12