I got that message 2 days ago when playing around (some of us can't help experimenting with the controls)I had my software update about two months ago and first it looked all fine, but now since a week or so I experienced a new error message, saying: ESC-OFF - downhill/uphill assistent not available.
I held the restart button before turning the ignition on and bingo! Error message.
Had to turn off , lock car and wait a few minutes. Then it fixed itself.