未定义属性错误

我有一个cakephp控制器的问题，我一直得到错误

未定义属性:AdsController::$getUrlsHTML

               public function getUrlsHTML($UrlId = 0) {
    // Called via AJAX to get HTML for CTAs
    // Provides insertable HTML based on list from getCalloutsActionsList()
    $this->layout = 'ajax';
    $UrlsList = $this->getUrlsActionsList($UrlId);
    $this->set('Urls', $UrlsList);
    $this->set('url', $UrlId);
    $this->render('/elements/ads/url');
}
private function getUrlsActionsList($UrlId = 0) {
    // Pulls appropriate Callouts list. Usually called by getCalloutsHTML()
    $Urls = $this->getUrlsHTML->getUrls();
    $UrlsList = array();
    foreach ($Urls as $Url) {
        $UrlsList[$Url['url']['id']] = $Url['url']['text']; 
    }
    return $UrlsList ;
}