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Try to reset the circuit breaker or unplug the dishwasher for 5 minutes to see if the electronics will reset. If that doesn't work then your touch control panel has just failed and will need to be replaced. The part is usually about $130 or so but you'll need the full model number located on a sticker around the front frame of the tub which can be seen if you open the door.
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You don't need to try both, just whatever is easier. Sometimes the dishwasher is hardwired from the house so if you can't unplug it under the sink, then just flip the breaker off to try it.