Fatal error: Uncaught Error: Class 'ApiPlatform\Core\Serializer\AbstractItemNormalizer' not found in /home/itscm/dev.its.cm/itsgateway/vendor/api-platform/core/src/Serializer/ItemNormalizer.php:35 Stack trace: #0 {main} thrown in /home/itscm/dev.its.cm/itsgateway/vendor/api-platform/core/src/Serializer/ItemNormalizer.php on line 35