erreur javascript

["olivier.terral" <olivier.terral@xxxxxxxxxxx>]

Hi,

I'm a new user of exoplatform, I've download this version of webos:

exo-enterprise-webos-r17990-tomcat.zip 
<http://forge.objectweb.org/project/download.php?group_id=151&file_id=8647>

I find an error javascript on the page 
http://localhost:8080/portal/public/webos/
when I click on sign in  it appears an alert :
       
         eXo.widget.UIAddWidget has no properties

and after th signin widget disappear and the error occurs when I click 
on another widget

I"m sorry for the lack of details, bvut I don't know the structure  of 
exo yet

I'm on windows XP SP2

Please help me