API ERROR 191

That error occurs when Facebook thinks that your site is trying to redirect to a page that's not owned by your application. Basically, if your website is at www.site.com, you should have the following settings in your Facebook application:
Site URL: www.site.com/
Base (or Domain) URL: site.com

If your site is trying to send the user to www.site2.com/ after they register, Facebook will detect this as a problem, and throw that error. The Domain URL above lets you send the user to www.site.com, sub.site.com or site.com, in case you use subdomains.

Finally, I just tried to register through Facebook on your site, and did not get the Facebook API Error message. However, I did receive the following error after giving my username, email address, and password:

Fatal error: require_once() [function.require]: Failed opening required '/XXXX/components/com_user/controller.php' (include_path='.:/opt/RZphp5/includes') in /XXXX/components/com_jfbconnect/controllers/loginregister.php on line 29

My email address was automatically from Facebook, so that means communication seems to be going well. However, I've never seen that error before, and its indicating that a file of Joomla core (the core User manager controller file) is missing. That's not normal or good at all. Have you modified Joomla in any way?

Thanks,
Alex

Daniel,
Scratch that all. I just realized you gave me administrator access to your site and I looked around a lot more. You have the Joomla 1.5 version of JFBConnect installed on your site, which is probably the cause of a lot of the problems above.

Please download and install the Joomla 1.6 version from the "My Subscriptions" area. You don't need to uninstall first, and all of your settings will be retained, so this shouldn't be too much of a hassle.

This should fix you right up.

Alex

Mark,
If you look at the HTML on the page, and search for "all.js", you'll find it twice. First is ours, the second is from another extension. It's re-including the Facebook library and also adding a different Facebook application ID.

That's the problem. If that's from the template, remove it. It may be from another extension that only shows up in that template though. Either way, once you remove the conflicting extension, you should be good to go. If there's features you need from the other extension, just let us know, as likely we have similar functionality or can help you implement a workaround to make both extensions play nicely together.

Thanks, and good luck,
Alex

Awesome! Glad to hear it worked.. and was a pretty easy fix. We like those Should you run into anything else, just let us know.

Finally, please consider leaving a rating and review on the JED for JFBConnect and/or our support. It's certainly not required, but very appreciated:
extensions.joomla.org/extensions/social-...ook-integration/7215

Thanks, and good luck,
Alex