Fatal error: Uncaught Error: Interface "Symfony\Component\Mime\Encoder\EncoderInterface" not found in /srv/www/sites/public/starter-projects/vendor/symfony/mime/Encoder/Rfc2231Encoder.php:19 Stack trace: #0 {main} thrown in /srv/www/sites/public/starter-projects/vendor/symfony/mime/Encoder/Rfc2231Encoder.php on line 19