Fatal error: Uncaught Error: Interface "Psr\Http\Server\MiddlewareInterface" not found in /home/myclienteu/howto/vendor/http-interop/http-server-middleware/src/MiddlewareInterface.php:12 Stack trace: #0 {main} thrown in /home/myclienteu/howto/vendor/http-interop/http-server-middleware/src/MiddlewareInterface.php on line 12