If you have the correct size tape cassette installed and still getting the message, remove the tape cassette from the machine and reinstall it.
If you select AUTO size the machine will automatically select the maximum font size that will fit the cassette tape inside the machine. The maximum font size that can be used with each tape width contains one line of text are: 12mm on a 1 inch tape, 9mm on a inch tape, 6mm on a inch tape, 4mm on a 3/8 inch tape, and 3mm on a inch tape. Press the ' BS' key to clear the message and install a wider cassette tape or change to a smaller size font by pressing the ' Format' key. This message appears because the selected character font size cannot fit onto the cassette tape in the machine.