Fatal error: Uncaught Error: Interface "Symfony\Component\Serializer\Normalizer\DenormalizerInterface" not found in /var/www/crm_killing_ninja/core/backend/MediaObjects/Services/UploadedFileDenormalizer.php:33 Stack trace: #0 {main} thrown in /var/www/crm_killing_ninja/core/backend/MediaObjects/Services/UploadedFileDenormalizer.php on line 33