Fatal error: Uncaught Error: Class "Symfony\Component\Routing\Loader\AttributeFileLoader" not found in /media/jean/learning/huagai/drupal/vendor/symfony/routing/Loader/AttributeDirectoryLoader.php:24 Stack trace: #0 {main} thrown in /media/jean/learning/huagai/drupal/vendor/symfony/routing/Loader/AttributeDirectoryLoader.php on line 24