So from what I can tell the “Community Toolbar” is from Conduit. It seems you get this message if you installed it, or a variety of other toolbars that are versions of it with different names, and then uninstalled it by deleting only one component and not the rest.
One solution I see is to install it again, and then use its uninstall function to uninstall it properly.
But first, try looking in /Library/Application Support/ for a Conduit folder. Look in both the master /Library/Application Support/ and your user /Library/Application Support/. Get rid of that Conduit folder. See if it works.