That error is saying it can't properly find Community Builder. Do you have Community Builder installed? If not, please disable the JFBConnect - Community Builder profile plugin from the plugin manager of Joomla. If there are other profile plugins enabled there for 3rd party extensions you don't have installed, disable those too.
If you do have Community Builder installed, let us know. That would be an issue we haven't heard of, and we'd need to investigate further.
Hope that helps,
Alex