Quite often happens if ground power yanked out without asking and a voltage spike occurs. It is a no go but you can clear the status message by(I think) performing a stall warning test and then attempting to clear the msg.
otherwise its switch off aircraft, battery off, sit ion the dark for a couple of minutes, switch it on again and see what happens ............
Hopefully you have an engineer around to save you all this bother, or one on the end of a telephone.
It is for sure a no go if you cant clear it.