This is a standard message that can come on for a variety of different reasons ranging from a faulty cassette to much more difficult to rectify problems, its really a case of watching if any error code number shows at the same time as thats the thing that indicates a specific area. A partial reset to the camcorder is always given if the battery is taken out for a few minutes before reinserting it again, however this may not make any difference depending on the reason for the warning in the first place.