Fatal error: Uncaught Error: Interface "Symfony\Component\Serializer\Mapping\ClassMetadataInterface" not found in /home/zdpktgd/ptc/vendor.old/symfony/serializer/Mapping/ClassMetadata.php:17 Stack trace: #0 {main} thrown in /home/zdpktgd/ptc/vendor.old/symfony/serializer/Mapping/ClassMetadata.php on line 17