You look to be using Joomla 1.6. Unfortunately, with the 4.2 release, we implemented an auto-update mechanism that requires 1.7 or higher. We'd highly recommend upgrading to 2.5.4, the most recent release available, as there has been a "critical" security vulnerability that fixed in all 1.6, 1.7 and 2.5 releases up until 2.5.3.
You can upgrade using the Update manager of Joomla, which should make the process pretty simple.
If you absolutely don't want to upgrade, we can help you remove the update functionality in JFBConnect so that you can get past that error.
Sorry for the inconvenience,
Alex