Fatal error: Uncaught Error: Interface "Psr\Http\Message\ServerRequestInterface" not found in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-extbase/Classes/Mvc/RequestInterface.php:23 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-extbase/Classes/Mvc/RequestInterface.php on line 23