Having trouble with calendar server with SSO in communication express

I have configured communication express with components calendar, messaging and access manager. I am able to login that but when i click on calendar ,it says "Aplication Error" NULL pointer Exception. I am able to access address book and options for all of them. i checked the am_sso.log , it has statement

com.sun.uwc.UWCMainViewBean <init>

SEVERE: UWCMainViewBean:forwardToURL(forwardtodefview) - null

Can anybody tell me how to fix that problem?

Thanks

[492 byte] By [Kinnari] at [2007-11-26 8:33:31]