No matter how many times you try it, the app ‘See Who Viewed Your Profile’ on Facebook will not work because it’s a SCAM!
There was a Facebook app that was released a couple of years ago that let users check how other people react their profile, it was called Fan Check. This application ranks your friends based on how often they interact with your Facebook wall. Interactions counted include wall posts, comments, likes, gifts and other public items posted to your wall. The app, however, does count page views or private messages.
"Can I know who's viewing my profile or how often it's being viewed?
No, Facebook does not provide the ability to track who is viewing your profile, or parts of your profile, such as your photos. Applications by outside developers cannot provide this functionality, either. Applications that claim to give you this ability will be removed from Facebook for violating policy."
If you really want to know who’s viewing your profile, try signing up for Friendster.