Debugging ASP pages on IIS 7

An error occurred on the server when processing the URL. Please contact the system administrator.
If you are the system administrator please click here to find out more about this error.

In feature View

1. click on ASP

2. Expand Debugging properties

3. Change " Send Errors to Browser" to True.

That's it . You may or may not have to restart the website , I did not have to.