Fatal error:Call to a member function get_users_count()

/*
 *前台控制器基础类
 */
 class FrontendApp extends ECBaseApp
 {
     function __construct()
     {
         $this->FrontendApp();
     }
     function FrontendApp()
     {
         Lang::load(lang_file('common'));
         Lang::load(lang_file(APP));  //问题就出在这里了
         parent::__construct();
 
         // 判断商城是否关闭
         if (!Conf::get('site_status'))
         {
             $this->show_warning(Conf::get('closed_reason'));
             exit;
         }
 
         $this->assign('copyright', Conf::get('copyright'));
         $this->_statistic();
     }
     //省略代码
 }