Fatal error: Uncaught Error: Interface "Psr\Http\Server\RequestHandlerInterface" not found in /opt/lampp/htdocs/forum/flarum/vendor/fof/oauth/src/Controllers/TwitterAuthController.php:34 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/fof/oauth/src/Controllers/TwitterAuthController.php on line 34