Fatal error: Uncaught Error: Class "ApiPlatform\Serializer\AbstractItemNormalizer" not found in /home/ntpcbgtpp/public_html/mat1/vendor/api-platform/core/src/Hal/Serializer/ItemNormalizer.php:42 Stack trace: #0 {main} thrown in /home/ntpcbgtpp/public_html/mat1/vendor/api-platform/core/src/Hal/Serializer/ItemNormalizer.php on line 42