can I get detailed information from facebook.login() return

I was following http://developer.anscamobile.com/reference/index/facebooklogin to use facebook.login() API, but in event.phase, I kept getting “loginFailed” but I did not know what was the reason. Just wonder, is there a way that I can get the more detailed error information returned from Facebook server side about this failure so that it is easier for me to trace down. Thanks. [import]uid: 90 topic_id: 23398 reply_id: 323398[/import]