Fatal error: Uncaught Error: Class "Drupal\Core\EventSubscriber\HttpExceptionSubscriberBase" not found in /home/qcsvlel/www/core/modules/user/src/EventSubscriber/AccessDeniedSubscriber.php:20 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/modules/user/src/EventSubscriber/AccessDeniedSubscriber.php on line 20