I receive this when I run error check for autotune.
I have verified that the plugin is enabled.
Test: JFBCSystem plugin is enabled
Fail: Not Detected! Please enable in the Site Config area of Autotune or in the Joomla plugin manager.
If the JFBCSystem plugin is enabled, but you still get this error, please check:
Your site is not in Offline Mode. If so, turn your site Online and re-run the Error Checker.
If you have a 'mobile template', disable it and re-test
Some templates have their own Facebook integration, and actively try to remove other Facebook extensions files. Try a different template.
No further tests can be run until fixed.