Fatal error: Uncaught Error: Class "Symfony\Component\Serializer\Context\Normalizer\AbstractObjectNormalizerContextBuilder" not found in /home/zdpktgd/ptc/vendor.old/symfony/serializer/Context/Normalizer/PropertyNormalizerContextBuilder.php:21 Stack trace: #0 {main} thrown in /home/zdpktgd/ptc/vendor.old/symfony/serializer/Context/Normalizer/PropertyNormalizerContextBuilder.php on line 21