ok ho risolto il problrma non é mescoli / e \ pero ora mi da un altro errore

Fatal error: require_once(): Failed opening required 'C:\Users\giuliano\PhpstormProjects\sito\views\fro ntend/controllers/controller_menu.php' (include_path='.;C:\php\pear') inC:\Users\giuliano\PhpstormProjects\sito\views\fron tend\view_menu.php on line 2