Fatal error: Uncaught Error: Class 'Symfony\Component\Mailer\Transport\AbstractTransportFactory' not found in /var/www/typo3/vendor/symfony/mailer/Transport/SendmailTransportFactory.php:19 Stack trace: #0 {main} thrown in /var/www/typo3/vendor/symfony/mailer/Transport/SendmailTransportFactory.php on line 19