Fatal error: Uncaught Error: Interface "Symfony\Component\Mime\Encoder\ContentEncoderInterface" not found in /srv/www/sites/public/starter-cms/vendor/symfony/mime/Encoder/EightBitContentEncoder.php:17 Stack trace: #0 {main} thrown in /srv/www/sites/public/starter-cms/vendor/symfony/mime/Encoder/EightBitContentEncoder.php on line 17