ช่วยดู Error Cannot send session cache limiter หัวจะระเบิดแล้ว

<?php
   require_once "include/header.php";
   session_start();   
   if($_REQUEST['login_submit']){
        if($_REQUEST['login_submit'] == "guest"){
                $_SESSION['cdd']['sysname'] = "Guest";
                $_SESSION['cdd']['logged'] = true;
                header("Location: index.php?mod=report");
        } else {
            $data = $odbc->query("SELECT * FROM tbl_user WHERE u_user = '". $_REQUEST['login_user'] ."' AND u_pwd = '". $_REQUEST['login_pass'] ."'");
            if(count($data)>0){
                $_SESSION['cdd']['sysname'] = "CDDCenter";
                $_SESSION['cdd']['logged'] = true;
                $_SESSION['cdd']['userinfo'] = $data[0];
                header("Location: main.php");
            } else {
                header("Location: login.php?err=login_fail");
            }
        }
    }

    if($_REQUEST['err']){
        $system['onload_ascript'] = "errLogin();";
    }
?>