If you receive this message it means either the Stripe Credit Card Reader on the iPad is not plugged in or the Reader has been turned off.

FIX: First make sure the Reader is plugged in. Once plugged in, it will automatically also turn on the Reader and green lights will temporarily appear on the right side of the Reader.

If the Reader is plugged in, go ahead and hold the Power button on the bottom of the reader until the green lights appear on the right side of the Reader.