Fatal error: Uncaught Error: Interface "Psr\Http\Server\MiddlewareInterface" not found in /var/www/html/dev.hallescherfc.de/packages/muthsevshop/Classes/Middleware/CartCounter.php:24 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/packages/muthsevshop/Classes/Middleware/CartCounter.php on line 24