Fatal error: Uncaught Error: Interface 'Drupal\Core\DependencyInjection\ContainerInjectionInterface' not found in /var/www/html/tmp/contrib/flag/src/Controller/ActionLinkController.php:23 Stack trace: #0 {main} thrown in /var/www/html/tmp/contrib/flag/src/Controller/ActionLinkController.php on line 23