After installing the new roll, you must reset the number of lanes in the cloth menu. Do this by going to your home screen and tap on the roll of cloth located in the bottom right of the screen. The machine settings will be displayed, tap the CLEANING SETTINGS button. At the bottom of the screen you will have a button for CLEANER, SQUEEGEE and DUSTER. Tap the DUSTER button and in the middle of the screen you will have a RESET button. Tap this button and it will prompt you to select OK.