ngg validate cookie fail

if (wp_validate_auth_cookie()) {
        $results = wp_parse_auth_cookie();
        $logged_in = FALSE;
        if (isset($results['username']) && isset($results['expiration'])) {
                if (time() < floatval($results['expiration'])) {
                        if (($userdata = get_user_by('login', $results['username'])))
                                $logged_in = $userdata->ID;
                }
        }

        if (!$logged_in) die("Login failure. -1");
        else if (!user_can($logged_in, 'NextGEN Upload images')) {
                die('You do not have permission to upload files. -2');
        }
}