Fatal error: Uncaught Error: Class "ApiPlatform\Core\Serializer\AbstractItemNormalizer" not found in /home/dbdevweblamp/public_html/vendor/api-platform/core/src/Serializer/ItemNormalizer.php:36 Stack trace: #0 {main} thrown in /home/dbdevweblamp/public_html/vendor/api-platform/core/src/Serializer/ItemNormalizer.php on line 36