Fatal error: Uncaught Error: Class "OOUI\PanelLayout" not found in /var/www/html/orian-wiki/vendor/oojs/oojs-ui/php/layouts/StackLayout.php:8
Stack trace:
#0 {main}
thrown in /var/www/html/orian-wiki/vendor/oojs/oojs-ui/php/layouts/StackLayout.php on line 8