It means the flood switch has activated. Turn power off at wall first. Then remove lower panel under door. Flood switch is at the front near the centre of the door. Small polystyrene float lifts up if water present & operates switch. If water on the tray you need to find were leak came from. You could try drying off tray & run another cycle to see if water comes back. May of been a one off event.
Lincoln Appliance NZ, October 2008