Sorry for troubles you've run into. The most common cause of login errors like that are if you've enabled all of the JFBConnect profile plugins. You should only enable the profile plugins for extensions that you actually have. So, for example, if you don't have Community Builder, don't enable the JFBCProfiles - Community Builder plugin. The same goes for the rest.
Hope that helps, but if that's not the issue, let us know and we'll help investigate other possible causes.
Thanks,
Alex
Login error
