Tivo says I need a turning adapter? Whaaat?

My Tivo keeps telling me it can't find my tuning adapter. I need to contact my cable supplier and obtain one.

Cox says you don't need one in my area. My system was set up (After much distress and several service calls that were solved by removing a Cox installed filter on the pole.) It has been working properly for more than a year. And now this. Any ideas?