os:inventory

Hi there

after logon as described in the pdf I receive this error
----------------------------
WARNING :
Time: [07.07.2009 12:06:27] :
Error number: 2 :
Type: Php Warning :
session_start() [function.session-start.html]: Cannot send session cache
limiter - headers already sent (output started at
C:\inetpub\imhofnet\osinventory\lib\forms\chart.class.php:1) :
File: C:\inetpub\imhofnet\osinventory\lib\validator.class.php :
Line: 74
------------------------
it makes no difference between
http://imhofnet/osinventory/index.php?action=admin_login and
http://imhofnet/osinventory/index.php

thanks for your help

Felix