Problem iwith validation callback

Hello,

I write this bellow, my validation rules arre working, but the callback function not.
I'm new in codeigniter and maybe a little stupid, please help.

PHP Code:

public function add_annonce_do()
    {
        $this->form_validation->set_rules('modele', 'Modèle', 'required');
        $this->form_validation->set_rules('annee', 'Année', 'required|callback_annee_check');
        $this->form_validation->set_rules('km', 'km', 'required');
        $this->form_validation->set_rules('prix', 'Prix', 'required');
        $this->form_validation->set_rules('description', 'Description', 'required');
        if ($this->form_validation->run() == FALSE)
        {
            $this->load->view('admin_header');
            $data['marque']=$this->marque->get_all_marque();
            $data['carburant']=$this->carburant->get_all_carburant();
            $this->load->view('annonce_add_display',$data);
            $this->load->view('admin_footer');
        }
        else
        {
            //traitement du formulaire
            $this->load->view('formsuccess');
        }
        
        

    }
    //callback validation
    public function annee_check($annee)
        {
                $current_year=date('Y');
                if (($annee <= 1870) || ($annee >= $current_year))
                {
                        $this->form_validation->set_message('annee_check', 'L’année n’est pas valide');
                        return FALSE;
                }
                else
                {
                        return TRUE;
                }
        }