I got mine to work as well. Even though I was putting in the site URL without the www prefix, somehow FB wasn’t saving the value. Eventually it got saved, and now it works.
Nice app…
I have the same problem, and it looks like I am following the instructions exactly. I would appreciate some help!
My wordpress website is http://www.sustainablesurf.org
So the App Domain setting on the FB App should be “sustainablesurf.org”?
This is what I have done, but I get the error above.
Let me know what to do. Thank you
