Fatal error: Uncaught Error: Class "Drupal\Core\EventSubscriber\HttpExceptionSubscriberBase" not found in /home/qcsvlel/www/core/lib/Drupal/Core/EventSubscriber/ExceptionJsonSubscriber.php:13 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/lib/Drupal/Core/EventSubscriber/ExceptionJsonSubscriber.php on line 13