Auth and HTTP_Session with DB-container

[tb323]

I've already posted this in the HTTP section but since they are related I hope I'm not breaking any rules by posting it here as well.

I've made a simple login page with the Auth-package on one page pretty much like in the documentation:

-------------------------
<?php
require_once "Auth.php";

function loginFunction()
{
/*
* Change the HTML output so that it fits to your
* application.
*/
echo "<form method=\"post\" action=\"test.php\">";
echo "<input type=\"text\" name=\"username\">";
echo "<input type=\"password\" name=\"password\">";
echo "<input type=\"submit\">";
echo "</form>";
}

$options = array(
'dsn' = "mysql://user:password@localhost/database",
);
$a = new Auth("DB", $options, "loginFunction");

$a->start();

if ($a->checkAuth()) {

header('location:http:\\www.domain.com\page.php');
}
?>
---------------------------------

When the user logs in he is transfered to another page that checks again if he is authorized. All fine to this point, but then I want to use a new HTTP_Session to store some data in a database like this..

---------------------------------
HTTP_Session::useTransSID(false);
HTTP_Session::useCookies(true);

HTTP_Session::setContainer('DB', array('dsn' => database_Dsn(),'table' => 'tbl_sessiondata'));
HTTP_Session::start('mySession');

HTTP_Session::setExpire(time() + 300); // set expire to 300 seconds
HTTP_Session::setIdle(time() + 5); // set idle to 5 seconds
-----------------------------------

The problem is that I get this error message and I have no idea how to solve it.. :

Warning: session_module_name(): A session is active. You cannot change the session module's ini settings at this time.

Is it possible to run an Auth session together with a HTTP_Session on the same page?