Windows 2008 Terminal Server Mandatory profile error

I have implemented the mandatory profiles in W2K8 TS using , the following group policies .
Computer config > Admin template > Windows Components > terminal Services > terminal Server > profiles
" Set Path for TS roaming User profile  & Use mandatory profile on the terminal Server "
If I login using an Administrator account everyting works fine . ( Profile loads from the defined path & get removed when logoff)
But if I login using a normal user account , it through the following error ,
"group policy client service failed to login access is denied" and logoff from the system

The following events are logged in App event ,
Log Name:      Application
Source:        Microsoft-Windows-Winlogon
Date:          26/04/2009 3:39:46 PM
Event ID:      6004
Task Category: None
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      Abraham.rhac.nsw.edu.au
Description:
The winlogon notification subscriber <GPClient> failed a critical notification event.
Log Name:      Application
Source:        Microsoft-Windows-Winlogon
Date:          26/04/2009 3:39:50 PM
Event ID:      6001
Task Category: None
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      Abraham.rhac.nsw.edu.au
Description:
The winlogon notification subscriber <Sens> failed a notification event.

Need help !!