This is my third question about posting on Facebook.
Although this may be a duplicate of Mac OS X Facebook login failed - no stored remote_app_id for app but I decid
just copy and paste the bundle ID you have in your xcode, into where facebook wants the Bundle ID
a sample pic is here http://kosovich.org.ua/tmp/facebook_ios6_app_howto.png
Say for eg, your bundle ID is named com.parse. (e.g. com.parse.myDateApp) but that into bundle ID. And make sure you check the box that says Facebook login