Cant load my view

[eluser]lucasvm[/eluser]
Thank you, thats works, but now im trying to show some content from my database but i get undefined variable data on my index, this is my code in funcion index:

Code:

function index()
    {
                $this->load->database();
                $query = $this->db->query('myquery');
                foreach ($query->result() as $row)
                {
                    $data['titulo'] = $row->titulo;
                    $data['contenido'] = $row->contenido;
                    $data['autor'] = $row->autor;
                }

                $this->load->view('header');
                $this->load->view('principal', $data);
                $this->load->view('footer');
    }

but if i do echo $data on my index view i get variable undefined, why?