Fatal error: Uncaught Error: Interface "Drupal\Core\DependencyInjection\ContainerInjectionInterface" not found in /home/www/drupal8/test/core/modules/contextual/src/ContextualController.php:17 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/contextual/src/ContextualController.php on line 17