Fatal error: Uncaught Error: Interface "Symfony\Component\Serializer\Encoder\DecoderInterface" not found in /home/zdpktgd/ptc/vendor.old/symfony/serializer/Encoder/JsonDecode.php:23 Stack trace: #0 {main} thrown in /home/zdpktgd/ptc/vendor.old/symfony/serializer/Encoder/JsonDecode.php on line 23