Fatal error: Uncaught Error: Interface "Psr\Http\Server\MiddlewareInterface" not found in /opt/lampp/htdocs/forum/flarum/vendor/fof/oauth/src/Middleware/ErrorHandler.php:27 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/fof/oauth/src/Middleware/ErrorHandler.php on line 27