Fatal error: Uncaught Error: Interface "Symfony\Component\Serializer\Normalizer\NormalizerInterface" not found in /home/zdpktgd/ptc/vendor.old/symfony/serializer/Normalizer/DateTimeNormalizer.php:24 Stack trace: #0 {main} thrown in /home/zdpktgd/ptc/vendor.old/symfony/serializer/Normalizer/DateTimeNormalizer.php on line 24