Maksud pesan error

June 8, 2011 by ekopackerjozz

Gan ada yg tau maksud pesan error ini ga?
A PHP Error was encountered
Severity: Notice
Message: Undefined property: Notifikasi::$db
Filename: core/Model.php
Line Number: 50
Fatal error: Call to a member function query() on a non-object in C:\xampp\htdocs\CI-KEKE\application\models\notif_order_model.php on line 25

ni modelnya,

Class Notif_order_model extends CI_Model
{
	function Notif_order_model()
	{
		parent::__construct();
	}
	function tes($id_member)
	{		
		$sql = "select * from pesanan o,notif_to_order m 
				where o.id_pesanan = m.id_pesanan &&
				o.id_member=".$id_member."";
		$query = $this->db->query($sql);
                return $query->result_array();
	}	
}

ni controller,
function index(){
$data['isi'] = $this->notif_order_model->tes($this->id_member);
foreach($isi as $content):
echo $content['id_pesanan'];
endforeach;

$data['jumlah_notif'] = 5;
$data['page'] = 'home';
$this->load->vars($data);
$this->load->view('pages-member/container');
}

Maksih sebelumnya yg berniat bantu