Fatal error: Uncaught Error: Interface 'Symfony\Component\Mime\Encoder\ContentEncoderInterface' not found in /mnt/volume_lon1_01/backend/admin/vendor/symfony/mime/Encoder/EightBitContentEncoder.php:17 Stack trace: #0 {main} thrown in /mnt/volume_lon1_01/backend/admin/vendor/symfony/mime/Encoder/EightBitContentEncoder.php on line 17