Fatal error: Uncaught Error: Class "Symfony\Component\Mailer\Transport\AbstractTransport" not found in /home/bimmertest/BookStack/vendor/ssddanbrown/symfony-mailer/Transport/NullTransport.php:21 Stack trace: #0 {main} thrown in /home/bimmertest/BookStack/vendor/ssddanbrown/symfony-mailer/Transport/NullTransport.php on line 21