Fatal error: Uncaught Error: Class "ApiPlatform\Serializer\AbstractCollectionNormalizer" not found in /home/ntpcbgtpp/public_html/mat1/vendor/api-platform/core/src/Hydra/Serializer/CollectionNormalizer.php:35 Stack trace: #0 {main} thrown in /home/ntpcbgtpp/public_html/mat1/vendor/api-platform/core/src/Hydra/Serializer/CollectionNormalizer.php on line 35