I am trying to add an app to my page.

Ive tried:
<http://www.facebook.com/dialog/pagetab?app_id=####&next=http://www.facebook.com/evendark>
http://www.facebook.com/dialog/pagetab?app\_id=####&next=www.facebook.com/evendark

I get 

API Error Code: 191
API Error Description: The specified URL is not owned by the application
Error Message: redirect\_uri is not owned by the application.

What am I doing wrong? this always worked before and thats all any of the search sites do. All I want is an iframe displayed as a tab. Thats all. Nothing fancy. I know the ID I am using is the right one Ivee done this before. UGH!