Fatal error: Uncaught Error: Interface "Psr\Http\Server\MiddlewareInterface" not found in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-frontend/Classes/Middleware/ContentLengthResponseHeader.php:35 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-frontend/Classes/Middleware/ContentLengthResponseHeader.php on line 35