Fatall error при вызове страницы с содержимым

    Вылетает Fatal error</b>:  Uncaught Error: Call to a member function getPages() on null in W:\domains\cms.loc\admin\Controller\PageController.php:12
    Stack trace:
    #0 [internal function]: Admin\Controller\PageController-&gt;listing()
    #1 W:\domains\cms.loc\engine\Cms.php(47): call_user_func_array(Array, Array)
    #2 W:\domains\cms.loc\engine\Bootstrap.php(21): Engine\Cms-&gt;run()
    #3 W:\domains\cms.loc\admin\index.php(6): require_once('W:\\domains\\cms....')
    #4 {main}
      thrown in <b>W:\domains\cms.loc\admin\Controller\PageController.php

пробовал переписать, не помогает

    <?php
namespace Admin\Controller;

class PageController extends AdminController
{
    public function listing()
    {
        $this->load->model('Page');
        ***Ошибка тут!***   $this->data['pages'] = $this->model->page->getPages();
        $this->view->render('/pages/list', $this->data);
    }
    public function create()
    {
        $this->view->render('/pages/create');
    }
    public function edit($id)
    {
        $this->load->model('Page');
        $this->data['page'] = $this->model->page->getPageData($id);
        $this->view->render('pages/edit', $this->data);
    }
    public function add()
    {
        $this->load->model('Page');
        $params = $this->request->post;
        if(isset($params['title'])) {
            $pageId = $this->model->page->createPage($params);
            echo $pageId;
        }
    }
    public function update()
    {
        $this->load->model('Page');
        $params = $this->request->post;
        if(isset($params['title'])) {
            $pageId = $this->model->page->updatePage($params);
            echo $pageId;
        }
    }
}