Fatal error: Uncaught Error: Class "ApiPlatform\Serializer\AbstractItemNormalizer" not found in /home/wizilen/www/vendor/api-platform/json-hal/Serializer/ItemNormalizer.php:42 Stack trace: #0 {main} thrown in /home/wizilen/www/vendor/api-platform/json-hal/Serializer/ItemNormalizer.php on line 42