Fatal error: Uncaught Error: Class "Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer" not found in /var/www/html/API_Forum/vendor/api-platform/serializer/AbstractItemNormalizer.php:52 Stack trace: #0 {main} thrown in /var/www/html/API_Forum/vendor/api-platform/serializer/AbstractItemNormalizer.php on line 52