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Acarvox,
I'm not sure why you're getting that error. Many times, this happens when the application is configured incorrectly for some reason (usually, the Site or Domain URLs do not point at your site). Can you check and report on the following things:
1) In the Facebook application, you should have these settings configured as follows:
Site URL: www.influenster.com/
Domain URL: influenster.com

2) If you try to login using a Facebook user who's the administrator of the application, you should get more information that just "An error has occurred". Can you do so, and let us know what the error is? More detailed errors are only shown to admins of the app, so we can't see it.

3) Finally, when I try to go to the application page in Facebook, I get redirected to my profile page. I'm not sure why this is, but it's an indicator that something isn't right:
www.facebook.com/apps/application.php?id=209049512441558

Please check the above things, and hopefully, something will stand out at you. Either way, keep us posted!