Using Amember along side a codeigniter site

I am trying to get amember working with my codeigniter site.

I have put the following within my index() method of my welcome controller.

Code:

public function index()
    {
        include("members/library/Am/Lite.php");
        Am_Lite::checkAccess(Am_Lite::ONLY_LOGIN );
        $this->load->view('welcome_message');
    }

I am getting the following error.I renamed the amember directory to members.

Fatal error: Call to undefined method Welcome::hasIdentity() in C:\wamp\www\musicians-\musicians-u\members\library\Am\Lite.php on line 127

I had tried that. Here is the complete controller code.

Code:

<?php
include("members/library/Am/Lite.php");
if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Welcome extends CI_Controller {

    /**
    * Index Page for this controller.
    *
    * Maps to the following URL
    *        http://example.com/index.php/welcome
    *    - or -
    *        http://example.com/index.php/welcome/index
    *    - or -
    * Since this controller is set as the default controller in
    * config/routes.php, it's displayed at http://example.com/
    *
    * So any other public methods not prefixed with an underscore will
    * map to /index.php/welcome/<method_name>
    * @see http://codeigniter.com/user_guide/general/urls.html
    */
    public function index()
    {

        Am_Lite::checkAccess(Am_Lite::ONLY_LOGIN );
        $this->load->view('welcome_message');
    }
}

/* End of file welcome.php */
/* Location: ./application/controllers/welcome.php */

That got it. Thanks!