[phpOpenTracker-general] first time user

hi all, l have followed the specific installation instructions however 
after running my first test page with simple :

|<?php

// prepend phpOpenTracker

include 'admin/phpOpenTracker.php';



// log access

phpOpenTracker::log();

?>


_I get the following error :_ 

|*Warning*: session_register(): Cannot send session cache limiter -
headers already sent (output started at E:\www\portal\index.php:4) in *E:\www\portal\admin\phpOpenTracker\Container.php* on line *67*


would someone mind helping me out, thanks in advance.