Error: Undefined constant App\Core\Response::Response

#0 /var/www/amy397/data/www/game.amypay.ru/app/Core/Router.php(121): App\Controllers\SitemapController->index(Object(App\Core\Request))
#1 /var/www/amy397/data/www/game.amypay.ru/app/Core/Router.php(97): App\Core\Router->invoke('SitemapControll...', Array, Object(App\Core\Request))
#2 /var/www/amy397/data/www/game.amypay.ru/app/Core/Application.php(48): App\Core\Router->dispatch(Object(App\Core\Request))
#3 /var/www/amy397/data/www/game.amypay.ru/public/index.php(59): App\Core\Application->run()
#4 {main}