The same code is working on another machine (which is not the server) but is not working on my machine. I  am getting the error as stated above.

I have set the Impersonation Username and Password in the c360.config.

Thanks

This error indicates that the security settings in your web.config are not configure correctly. You need to make sure that you have the following two settings in the system.web section of your web.config:

<authentication mode="Windows"/>
<identity impersonate="true"/>