Dishwasher not draining. water standing up in bottom of dishwasher after cleaning not draininghi i

Question

water standing up in bottom of dishwasher after cleaning not draininghi i have i whirlpool adp 9410 dish washer . it worked yesterday but today it had water at the bottom and when i loaded it up and set it to wash the start button is flashing but not working have u got any ideas on how to sort it out . cheers cheryl