redirect doesn't work

[eluser]Snipper[/eluser]
Hi all,

When I call redirect function as below, it does not work. Can u help on this.

redirect('controller_name/function_name','location');


It fires the following message.

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\iasl_application\application\libraries\template.php:58)

Filename: helpers/url_helper.php

Line Number: 543