gettin this error when login successfully

[chandaboy]

My code is this:

<?php
//Start session
session_start();

//Check whether the session variable SESS_MEMBER_ID is present or not
if(!isset($_SESSION['SESS_MEMBER_ID']) || (trim($_SESSION['SESS_MEMBER_ID']) == '')) {
header("location: access-denied.php");
exit();
}

?>
and I am facing this warning, when I login succcessfully:

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent

if any buddy know this answer then plz tell it to me,

thnx

[darkpaw]

Take a look on this page: PHP: session_start - Manual for some ideas. Might be the encoding of the file.