have Fatal Error after update

The Joomal updater doesn't work with JFBConnect. It shouldn't even try to update or change anything, it just normally shouldn't work at all. I'm not sure what may have happened, and obviously, that's not good.

My guess is that somehow the administrator folders of JFBConnect are corrupt or were erased. These are the folders at /administrator/components/com_jfbconnect/. If those are not there, or if the models/config.php file is missing, that would explain the error. The solution would be to reinstall JFBConnect.

You can do that either by:
Copy the files back manually
* Simply unzipping the installation package. In the unzipped folders, there's an "admin" folder, try copying the contents of that to the /administrator/components/com_jfbconnect/ directory.
Re-install in Joomla
* Use the Joomla installer to re-install
* If you can't access the admin area, but want to use the Joomla installer, you will need to disable the JFBCSystem plugin in the database. You can use something like PHPMyAdmin to access the tables and change the enabled setting to '0' (zero) in the xyz_extensions table for the jfbcsystem element.

Of course, if you have a backup of your site, you may want to go that route. This isn't an issue we've ever heard of, and aren't sure why it's happened. We'll help how we can, but just don't have a magic solution right now.

Let us know how that goes,
Alex

Can you verify that the following file exists, is readable, and has something in it? Mainly, at the top, there should be a reference to "class JFBConnectModelConfig".
/administrator/components/com_jfbconnect/models/config.php

If that file is missing, then the installation of JFBConnect is really messed up for some reason, and you'll need to copy the files like I mention. Beyond that, the only reason the file above that is throwing the fatal error is loaded is if the JFBCSystem plugin is enabled. If that's disabled in the database tables, like I mentioned, JFBConnect won't load or do anything when you access the admin area.

So, with one of those, you should definitely be able to access at least the admin area. If not, then some other piece of code is trying to load our library... normally, that should be fine too, but obviously, something's going wrong on your site.

Hope that helps,
Alex