Fatal error: Uncaught Error: Interface "Psr\Http\Server\RequestHandlerInterface" not found in /home/sardosne/flarum.sardos.net/vendor/flarum/core/src/Admin/Controller/UpdateExtensionController.php:22 Stack trace: #0 {main} thrown in /home/sardosne/flarum.sardos.net/vendor/flarum/core/src/Admin/Controller/UpdateExtensionController.php on line 22