[Plugin: Facebook Comments for WordPress] No new comment notifications and invalid Id

I’m not getting new comments notifications wich makes this plug in pretty much useless cus I can’t be checking al my post and pages to see if I have new comments, it’s just very impractical, also showing an error message saying i have and invalid Id, I entered all information correctly, tried several times and even made a new app just to check, I just don’t know what else to do. The plugin is great but these two things are a deal breaker.

http://wordpress.org/extend/plugins/facebook-comments-for-wordpress/