Fatal error: Uncaught Error: Interface "Psr\EventDispatcher\StoppableEventInterface" not found in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-backend/Classes/Routing/Event/BeforePagePreviewUriGeneratedEvent.php:28 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-backend/Classes/Routing/Event/BeforePagePreviewUriGeneratedEvent.php on line 28