Fatal error: Uncaught Error: Class 'Symfony\Component\Mime\Part\AbstractMultipartPart' not found in /mnt/volume_lon1_01/backend/admin/vendor/symfony/mime/Part/Multipart/AlternativePart.php:19
Stack trace:
#0 {main}
thrown in /mnt/volume_lon1_01/backend/admin/vendor/symfony/mime/Part/Multipart/AlternativePart.php on line 19