Boondoc, I usually ignore that message. And it will go away on it's own many times after awhile. Following AC's advice as the post above indicates often fixes it, but doesn't always for me. The problem always eventually comes back.
sometimes restarting my server (which stops then restarts the AC service) will cure it for awhile, then it comes back.
doesn't seem to affect AC any more than just being a nuisance.
