Fatal error: Uncaught Error: Interface 'Symfony\Component\Serializer\Encoder\EncoderInterface' not found in /home/devmecseminars/public_html/mec/vendor/symfony/serializer/Encoder/YamlEncoder.php:24 Stack trace: #0 {main} thrown in /home/devmecseminars/public_html/mec/vendor/symfony/serializer/Encoder/YamlEncoder.php on line 24