registers with Facebook

Moda,
Your English fine

The problem is likely that you have some Community Builder fields marked as "Required" but are not importing anything into them from Facebook during registration. CB will not let us save a user if a required field does not have any data. To fix, please make sure you've installed the Social Profiles - Community Builder plugin that comes with JFBConnect. Then, either:
* Set Registration Mode to 'Normal' in JFBConnect. In the 'Profiles' area of JFBConnect, set the "Show fields" to "All fields" or at least "All required fields". That way, the user must fill in the information.
* Set the Registration Mode to 'Automatic' in JFBConnect. In the 'Profiles' area, make sure that any fields in CB that are marked as required have a field from Facebook 'mapped' to it. That will ensure the required fields are filled out.
* Another test would be to simply mark all Community Builder fields as 'not required' and test that way and make sure things work as expected.

Hope that helps,
Alex

Awesome! Glad that helped. If you need anything else, just let us know.

Finally, if you haven't already, please consider leaving a rating and review for JFBConnect, or our support, on the Joomla Extension Directory. It certainly isn't required, but is very appreciated:
extensions.joomla.org/extensions/social-...ook-integration/7215

Thanks,
Alex