Fatal error: Uncaught Error: Class "ApiPlatform\Core\Serializer\AbstractCollectionNormalizer" not found in /home/dbdevweblamp/public_html/vendor/api-platform/core/src/Hal/Serializer/CollectionNormalizer.php:28 Stack trace: #0 {main} thrown in /home/dbdevweblamp/public_html/vendor/api-platform/core/src/Hal/Serializer/CollectionNormalizer.php on line 28