Session Autoload Problem in CodeIgniter Framework

I have a problem in autoload session.

Here is the problem.

########################

A PHP Error was encountered

Severity: Notice

Message: Undefined variable: _SESSION

Filename: administration/admin_panel.php

Line Number: 7


########################

And Here is the admin_panel.php file

########################

<?php
class Admin_panel extends MY_Controller
{
	function Admin_panel()
	{
		parent::MY_Controller();
		
        $this->checkAdminLogin();
        $this->load->library('pagination');        
	}
    function index()
    {
        $data['mainContent'] = $this->load->view('administration/index', '', true);  
        $this->load->view('administration/template', $data);        
    }

}
?>

Code (markup):

########################

What about the problem.

Please help me.

Thanks
salayhin