I'm using the FB registration iFrame code on my site. I've followed all the documentation at http://developers.facebook.com/docs/plugins/registration/ but I can't understand why I have this error. The only thing I've ever been able to see is a red box with the words "Unable to load the registration form for . You may have previously blocked this app on Facebook. Go to your Facebook privacy settings to unblock this app. (Error: Invalid 'client_id'.)"
I've looked into what I says about apps being blocked, but this is simply NOT the case. The app is not blocked. I've even tried viewing the page with multiple FB accounts. This error is always displayed. I looked into my app settings to see if anything was wrong there. Some report that "Sandbox Mode" must be disabled or you can get this error, but mine is disabled. Always has been. I tried deleting the whole app all together and starting fresh. After doing so I get the same result.
One thing perhaps worth mentioning, my app is listed as "Unlisted" in the App center. Many are having this issue for unexplained reasons by FB.
App Detail Page Status: Live Your app detail page is now live and will appear in Search.
App Center Listing Status: Unlisted Your app is not listed because it does not have enough high ratings and user engagement to be listed in the App Center at this time. Please refer to your app's Insights page to view your app's user rating and engagement metrics, and view our App Center guidelines for more information.
Also another thing perhaps worth mentioning, I currently have a login and registration setup on the root of the website. I'm building a whole new site in a subdirectory where I'm trying to place the new FB login and registration. Could this be causing a conflict in some way?
Thanks!
` tags inside the URL value. – CBroe Oct 27 '12 at 20:16