Provide your strategy on identifying a mistake, taking responsibility, determining appropriate action, reporting to colleagues (or supervisors), and following up. Offer to provide an example of a mistake that you made and your response. Do not take the approach that you don't make mistakes, as an employer will not be impressed, in fact they will be concerned that you either are not aware of errors that you may make and/or would not accept responsibility and bring the error to their attention.
How do you correct a mistake?
Demonstrating your ability to admit to mistakes, take responsibility for them and act to address them accordingly is very important for employers. Errors do occur in work environments. An employer wants to ensure that you will manage them appropriately.