Fatal error: Uncaught Error: Interface "Psr\Http\Message\StreamInterface" not found in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-core/Classes/Http/SelfEmittableStreamInterface.php:27 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-core/Classes/Http/SelfEmittableStreamInterface.php on line 27