Fatal error: Uncaught Error: Interface "Psr\Http\Server\RequestHandlerInterface" not found in /usr/home/seoulsource/domains/kgaeul.web.id/public_html/vendor/flarum/core/src/Install/Controller/InstallController.php:28
Stack trace:
#0 {main}
  thrown in /usr/home/seoulsource/domains/kgaeul.web.id/public_html/vendor/flarum/core/src/Install/Controller/InstallController.php on line 28