Fatal error: Uncaught Error: Class "ApiPlatform\Serializer\AbstractCollectionNormalizer" not found in /home/wizilen/www/vendor/api-platform/json-hal/Serializer/CollectionNormalizer.php:28 Stack trace: #0 {main} thrown in /home/wizilen/www/vendor/api-platform/json-hal/Serializer/CollectionNormalizer.php on line 28