note 27639 added to function.session-start

I made some short php scripts using sessions on Windows. Everything looked fine, then i installed it to a public server. I get this message on every page: Warning: Cannot send session cache limiter - headers already sent (output started at /ultraweb/k/kanhb/taglista.php:2) in /ultraweb/k/kanhb/checkuser.php on line 2 All scripts start with session_start(), because i red, that they should start with it. Can anyone tell me what the problem is?? -- http://www.php.net/manual/en/function.session-start.php http://master.php.net/manage/user-notes.php?action=edit+27639 http://master.php.net/manage/user-notes.php?action=delete+27639 http://master.php.net/manage/user-notes.php?action=reject+27639