Message: Undefined property: Blog::$db

[eluser]Unknown[/eluser]
I am not good at English but I will try. I am using tutorials "Blog in 20 min" and i am receiving an undefined variable error message on line 22 which is:

Fatal error: Call to a member function get() on a non-object in C:\WebServ\httpd\CodeIgniter\system\application\controllers\blog.php on line 22

controller file:

Code:

class Blog extends Controller{

    function Blog(){

        parent::Controller();

        $this->load->scaffolding('entries');

        $this->load->helper('url');

        $this->load->helper('form');

    }

    function index(){

        $data['title'] =    "My title";

        $data['heading'] = "My heading";

        $data['query'] = $this->db->get('entries');

        $this->load->view('blog_view', $data);
    }
}

and view file:

Code:

<?=$heading?>
<br>

&lt;?php foreach($query->result() AS $row): ?&gt;

&lt;?=$row->title?&gt;

<br>

&lt;?=$row->body?&gt;

&lt;?=anchor('blog/comments', 'Comments');?&gt;

<hr>

&lt;?php endforeach; ?&gt;

some ideas?