Fatal error: Uncaught Error: Interface "Psr\Http\Server\RequestHandlerInterface" not found in /home/sardosne/flarum.sardos.net/vendor/flarum/extension-manager/src/Api/Controller/ConfigureComposerController.php:30 Stack trace: #0 {main} thrown in /home/sardosne/flarum.sardos.net/vendor/flarum/extension-manager/src/Api/Controller/ConfigureComposerController.php on line 30