note 29705 added to function.session-start

Hi all, I encounter the following error: Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at D:\Test\index.php:3) in D:\Test\index.php on line 4 May I know what's the cause of it and to resolve this problem? Thanks... -- http://www.php.net/manual/en/function.session-start.php http://master.php.net/manage/user-notes.php?action=edit+29705 http://master.php.net/manage/user-notes.php?action=delete+29705 http://master.php.net/manage/user-notes.php?action=reject+29705