Fatal error: Uncaught Error: Class "Symfony\Contracts\EventDispatcher\Event" not found in /home/tzuovhm/tzuovhm/nextcloud/3rdparty/symfony/mailer/Event/FailedMessageEvent.php:20 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/nextcloud/3rdparty/symfony/mailer/Event/FailedMessageEvent.php on line 20