Unable to Delete Email from Outlook Web App 2010

Hi everyone,
I have been using Microsoft outlook for sending emails.
Now i want to delete my emails from outlook Web App (OWA) 2010. i tried a lot but of no use.
Whenever i try deleting an email in OWA, an error appears as shown below:

I have been running Exchange 2010 SP2 with UR1. I don't know what's happening? it says my request couldn't be handled.
Anybody facing this kind of a problem, please help me in finding the solution.
Waiting for your replies
Regards,
Jane
