Zidestore: "tried to access private object"

Hello,
I install OpenGroupware without trouble and this is a really good tool !
... but i got a problem with the zidestore part. when i log into the 
zidestore interface every things ok except:

if i try the weblogin from the url http://192.168.0.100/zidestore/ the 
login box appear and bring me to the page: 
http://192.168.0.100/zidestore/weblogin  which failed (error 403 in the 
ogo.log) and give me a page with the following text : "An error occured 
during object publishing tried to access private object".
I found out that if i go directly to the url 
192.168.0.100/zidestore/david/ the homepage of the zidestore server's 
account appear.

But when i try to download the calendar the same error appear "An error 
occured during object publishing tried to access private object".

here's ogo.log
"Jan 30 16:47:10 ZideStore [28993]: |SxUserFolder:david| ERROR: got no 
class for personal folder 'Calendar': {
    class = SxAppointmentFolder;
}
192.168.0.6 - - [30/Jan/2004:16:47:10 GMT] "GET 
/zidestore/so/david/Calendar/calendar.ics HTTP/1.1" 403 197 0.018 - - 0
"

Does anybody know how to do to get rid of this error ??

Thanks for help and time

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