login back with facebook credentials

Hi there I've tried to avoid asking and hassling since I bought this beautiful component I was so busy trying to implement and read as much as I could to make it run smoothly.
Well everything is working fine until just now trying to figure out what is the problem after setting the configuration to automatic registration for user with facebook account all working fine except when the user try to login to joomla with facebook credentials [email used with facebook] and [password used with facebook]
I keep getting this message:
Username and password do not match or you do not have an account yet.
although the user is activated and already in the list of users in joomla and jomsocial users table.
am I missing something?

Thanks in advance

Thanks for the reply

Now I understand just got confused a little.

Well done