Fatal error: Uncaught Error: Class 'ApiPlatform\Core\Serializer\AbstractCollectionNormalizer' not found in /home/itscm/dev.its.cm/itsrestapi/vendor/api-platform/core/src/Hal/Serializer/CollectionNormalizer.php:26 Stack trace: #0 {main} thrown in /home/itscm/dev.its.cm/itsrestapi/vendor/api-platform/core/src/Hal/Serializer/CollectionNormalizer.php on line 26