Problem on my Controller

[eluser]Unknown[/eluser]
Hello guys

I'm new in CI, could you please help me in my problem...
I'm having some trouble in my controller

user.php

Code:

<?php

    class User extends CI_Controller{
        
        function User()
        {
            parent::Controller();
            $this -> view_data['base_url'] = base_url();
        }
        function index()
        {
            $this -> register();
        }
        
        function register()
        {
            $this -> load -> view('view_register',$this->view_data);
        }
    }

?>

and I have my view :view_register.php

where is the error?i can't find it.
I have set my controller :user.php in the /application/config/routes.php

Thank you in advance...