Fatal error: Uncaught Error: Interface "Symfony\Component\HttpFoundation\Session\SessionBagInterface" not found in /opt/lampp/htdocs/forum/flarum/vendor/symfony/http-foundation/Session/Storage/MetadataBag.php:23 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/symfony/http-foundation/Session/Storage/MetadataBag.php on line 23