What steps will reproduce the problem?
1.  fresh new install of yafb.
2.  enable yafb
3.  login to facebook first

What is the expected output? What do you see instead?
expect to see either create a new account if does not exist or login if exist.

instead I see "Please establish the connection to Facebook before continue"

What version of the product are you using? On what operating system?
vb 3.8.5
linux

Please provide any additional information below.

I got this error when clicking the "Connect with Facebook" button:

"Please establish the connection to Facebook before continue"

I even first log in at facebook.com then go to my site and it still says the 
above error.