Fatal error: Uncaught Error: Class "Symfony\Component\Console\Event\ConsoleEvent" not found in /media/jean/learning/huagai/drupal/vendor/symfony/console/Event/ConsoleTerminateEvent.php:24 Stack trace: #0 {main} thrown in /media/jean/learning/huagai/drupal/vendor/symfony/console/Event/ConsoleTerminateEvent.php on line 24