Flow Meter Disconnected

Solutions:

1. Unplug and replug the flow meter cable and restart the aircraft.

2. Replace the flow meter.

3. Replace the spraying adaptive board
4. Replace the spray module

5. Replace the spraying cable and spraying adaptive cable. 

It is typically an issue with a connection so you can try some contact cleaner when replugging in. If that does not fix the issue work down the progressions starting with the flow meter. Once you have replaced the parts necessary make sure to redo flow meter calibration.