Message Cannot modify header information - headers already sent

[eluser]marciol[/eluser]
there is no white space before the <?php openingtag in line 1

<?php if(!defined('BASEPATH'))exit('No direct script access allowed');
/*
|--------------------------------------------------------------------------
| Base Site URL
|--------------------------------------------------------------------------
|
| URL to your CodeIgniter root. Typically this will be your base URL,
| WITH a trailing slash:
|
| http://example.com/
|
*/
$config['base_url'] ="http://localhost/ci/";
/*