track : 404 Page Not Found: /index

App_log.php

<?php
/** filename: App_log.php
 *  put this file in Codeigniter Core folder
 */
class App_Log extends CI_Log
{
	
	function __construct()
	{
		parent::__construct();
	}

	function write_log($level = 'error', $msg, $php_error = FALSE)
    {
    	$url = $_SERVER['REQUEST_URI'];
    	$msg = $msg." | url : ".$url;
    	parent::write_log($level,$msg,$php_error);
    }
}