Fatal error: Uncaught Error: Interface "Symfony\Component\Serializer\SerializerInterface" not found in /home/zdpktgd/ptc/vendor.old/symfony/serializer/Debug/TraceableSerializer.php:28 Stack trace: #0 {main} thrown in /home/zdpktgd/ptc/vendor.old/symfony/serializer/Debug/TraceableSerializer.php on line 28