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