Fatal error: Uncaught Error: Class "Symfony\Component\Mime\Part\AbstractMultipartPart" not found in /var/www/html/app/vendor/symfony/mime/Part/Multipart/RelatedPart.php:20
Stack trace:
#0 {main}
thrown in /var/www/html/app/vendor/symfony/mime/Part/Multipart/RelatedPart.php on line 20