codeigniter - Unable to call model function from the controller -

i having problem code, below
error follow
( ! ) fatal error: call undefined method agentie_model::get_agentii_list() in c:\wamp\…controllers\fk_controller.php on line 65

controller:fk_controller

public function __construct() {     parent::__construct();      $this->load->model('agentie_model');     $this->load->model('fk_model'); }  public function add2() {     $this->load->model('agentie_model');               $data['principal'] = $this->agentie_model->get_agentii_list(); //here error(line 65)      $this->load->view('lista_agentii', $data); } 

model:agentie_model

private $_table = "agentii";  public function get_agentii_list() {     $query = $this->db->get($this->_table);     return $query->result(); } 

view:lista_agentii

echo "lista agentii:</br>";  foreach($principal $list) {    echo $list->nume_agentie; } 

 public function __construct()  {    parent::__construct();     $this->db = $this->load->database('default', true);   }    public function add2()  { $this->load->model('agentie_model',true);          $data['principal'] = $this->agentie_model->get_agentii_list(); //here      $this->load->view('lista_agentii', $data); }