Fatal error: Uncaught TypeError: call_user_func(): Argument #1 ($callback) must be a valid callback, class "controller\sitemap.xml\IndexController" not found in /www/wwwroot/story_factory/core/App.php:176 Stack trace: #0 /www/wwwroot/story_factory/core/App.php(176): call_user_func() #1 /www/wwwroot/story_factory/public/index.php(5): core\App::run() #2 {main} thrown in /www/wwwroot/story_factory/core/App.php on line 176