If you are using IE Explorer!
Symptoms
An ASP error occurred on one of your pages and your browser is reporting it to you by showing you this "Friendly Error."
Cause
This "Friendly Error" message setting is enabled by default in Internet Explorer.
Resolution
To disable the "Friendly Error" go to Tools (from the top menu bar) -> Internet Options -> Advanced and then deselect "Show HTTP Friendly Errors." After you have completed this step, run your code again and you should see the more detailed error message.
Hope this helps to find your problem1