I have had the same error message on a couple of different occassions. One being the media is oversized (wider than the maximum size, even though it fits through the printer)just trim down the first 12" of media so that when the printer initializes it only reads a useable size. The other instance is when I try to print on a roll that has had prior printing on it and the roll still has the print banding on the edge. The print head sensor reads the ink and assumes that is the edge of the media. I feed about 6-8" of media through the printer before I turn it on and it initializes so as not to get that error message. Hope this helps.