As soon as you start the vechile in park it chimes and displays the select neutral,then slow down..when you select drive a drive a few yards the message disappears but the arrows on either side of the display remain.
If an Auto car is in gear it won't start so it must be a faulty inhibitor switch or the selector slightly out of adjustment. Next time it does it try gently pushing/pulling the lever against the stop whilst in neutral without pressing the release button to see if the message goes away when stationary. Unplug and reconnect the sensor or as a last resort looks like a Testbook plug in to see if a fault is logged.