Fatal error: Uncaught Error: Class "Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer" not found in /home/zdpktgd/ptc/vendor.old/symfony/serializer/Normalizer/ObjectNormalizer.php:33 Stack trace: #0 {main} thrown in /home/zdpktgd/ptc/vendor.old/symfony/serializer/Normalizer/ObjectNormalizer.php on line 33