Fatal error: Uncaught Error: Interface "Symfony\Component\Mailer\Transport\TransportInterface" not found in /srv/www/sites/public/starter-projects/vendor/symfony/mailer/Transport/RoundRobinTransport.php:25 Stack trace: #0 {main} thrown in /srv/www/sites/public/starter-projects/vendor/symfony/mailer/Transport/RoundRobinTransport.php on line 25