Security exception with windows server 2003

hi all,

I am trying to access a web application built on the .NET 2.0 framework and I keep getting this error pop-up which asks me to select a debugger....

The error is:
system.security.cryptography.cryptographicexception caused by w3wp.exe(which is the w2k3 worker process).

any ideas why this is happening?

any help would be appreciated.

Thanks.

Cafedreamz.