I am using the AJAX Uploader in a web application.  When I am debugging and running the app in Visual studio 2010. I  receive the "Upload Module Not instaled in Web.Config" - when localhost Port is in URL

For example : 

http://localHost:12122/MyApp/default.aspx then the error "Upload module is not installed in web config" surfaces

However if I use the same page for the same app running in IIS7 in http://localhost/default.aspx then everything is fine