Fatal error: Uncaught Error: Class "Symfony\Component\Mailer\Exception\RuntimeException" not found in /home/kartulirest/public_html/xyz.kartulirest.de/vendor/symfony/mailer/Exception/TransportException.php:17 Stack trace: #0 {main} thrown in /home/kartulirest/public_html/xyz.kartulirest.de/vendor/symfony/mailer/Exception/TransportException.php on line 17