Fatal error: Uncaught Error: Interface 'Symfony\Component\Mailer\MailerInterface' not found in /home/benjamincb/demos/acdg-site/vendor/contao/core-bundle/src/Mailer/ContaoMailer.php:23 Stack trace: #0 {main} thrown in /home/benjamincb/demos/acdg-site/vendor/contao/core-bundle/src/Mailer/ContaoMailer.php on line 23