Fatal error: Uncaught Error: Class "Symfony\Component\Validator\Mapping\GenericMetadata" not found in /media/jean/learning/huagai/drupal/vendor/symfony/validator/Mapping/MemberMetadata.php:30 Stack trace: #0 {main} thrown in /media/jean/learning/huagai/drupal/vendor/symfony/validator/Mapping/MemberMetadata.php on line 30