redirected to add.php when debugging

Nov 15, 2007 at 11:59 PM
When I debug my application, why do I always get redirected to the following page:

http://www.facebook.com/add.php?api_key=xxxx&v=1.0

The details on the page are:

You've already added webappone to your Facebook applications.
Visit the My Applications page to adjust your settings or remove this app.

Why am I not redirected to my homepage, Default.aspx?