Fatal error: Uncaught Error: Interface "Symfony\Component\Serializer\Encoder\EncoderInterface" not found in /home/zdpktgd/ptc/vendor.old/symfony/serializer/Encoder/JsonEncode.php:21 Stack trace: #0 {main} thrown in /home/zdpktgd/ptc/vendor.old/symfony/serializer/Encoder/JsonEncode.php on line 21