Fatal error: Uncaught Error: Interface 'Symfony\Component\Serializer\Encoder\EncoderInterface' not found in /home/geofieldwa/www/concrete/vendor/symfony/serializer/Encoder/XmlEncoder.php:26 Stack trace: #0 {main} thrown in /home/geofieldwa/www/concrete/vendor/symfony/serializer/Encoder/XmlEncoder.php on line 26