dx_auth error

[eluser]Paleleaves[/eluser]
Hi,

this is my controller and if the user is not logged in I'm forwarding like this

Code:

if ( ! $this->dx_auth->is_logged_in())
        {
            $this->load->view('common/header');
            $this->load->view($this->dx_auth->login_view);
            $this->load->view('common/footer');
        }

But it throw an error like this..

A PHP Error was encountered

Severity: Notice

Message: Undefined variable: show_captcha

Filename: auth/login_form.php

Line Number: 50


What could be wrong?