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
When ever you sign up to developers.facebook.com you get a unique id http://developers.facebook.com/
Register your app over there and u get a unique app id and secret id you have to use that when you use your facebook sdk for integrating your app
the fbappname and fbappid then are to be entered in plist which will let you create your session
This happens when authenticating using iOS6 Accounts API.
All you have to do to get it working is:
All developers of a particular app, should be known to Facebook. While the application is in Sandbox mode (i.e. developer only access), all every user who want to use the Facebook platform, for testing/developing the application, will have to be added as a developer.
To know your Facebook ID: findmyfacebookid.com
We had the same problem, but since Facebook is changing layouts a lot, I'm posting what solved our problem with pictures again. The solution is similar to Andrew Kosovich's answer, but with new interface there are some changes.
Login to your Facebook Developers and select your problematic app.
Go to app's settings
Check if iOS is already added. If you find iOS section, go to step 4, otherwise add it, by clicking Add platform button.
Enter correct bundle ID of your application into the appropriate box.
After entering correct details the login with Facebook SDK should work.
Warning: Do not forget to enable Facebook access to your application in the Settings application of the specific iOS device.
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