Not able to record client sever application

I am not able to record client server application using load runner vugen ( is a client srever based Application built using Microsoft .Net 2005.
Database - MS SQL server 2005 database.

i tried with different protocols (Microsoft .net, ODBC and COM/DCOM). In all the cases,while recording i am getting the below error.

"An Unhandled win32 exception occured in <>.exe [4496].