Poll 2.0 Warning

After submiting a vote I get warning on the top of the page saying:

Warning: Cannot add header information - headers already sent by (output started at /nfs/cust/3/6/3/webcod/test.php:7) in /nfs/cust/3/6/3/webcod/poll/poll_cookie.php on line 21

Anyone has any ideas what's going on?

I guess the solution was there the whole time in FAQ
For future refrences here is solution:

FAQ:

- After voting I get the following error:
Warning: Cannot add header information - headers already sent by
(output started at ...) in ..poll_cookie.php on line ...

Make sure that the page your poll is embedded in has the
<?php require "poll_cookie.php"; ?>
tag before anything else.