Layout Library Redirecting Problem

Code:
&lt;?php 

class Users extends controller {

    function Users() {

        parent::Controller();

        $this->load->model('user_model','user');

        $this->load->model('users_model','users');

        $this->load->model('other_model');

        $this->load->library('layout','layout_main');

    }



    //===================================================

    

    # Giriş Yap

    

    function login() {

        $username = $this->db->escape_str($this->input->post('username'));

        $password = md5($this->input->post('password'));

        if ( $this->users->beLogin ( $username, $password )) {

            $userID = $this->user->getUserID ( $username );

            $this->session->set_userdata('user_id', $userID );

            $this->session->set_userdata('username',$username);

            $this->session->set_userdata('login',true);

            if ($this->users->isFirstLogin ( $username )) {

                redirect('users/first_login');

            } else {

                redirect('/main');

            }

        } else {

            $data['message'] = 'Kullanıcı Adınızı Veya Şifrenizi Yanlış Girdiniz!';

            $data['redirect'] = base_url();

            $data['time'] = 5;

            $this->layout->view('message_view',$data);    

        }

            

    }

}