Hi yuskay,
It means, you need to describe a situation in your professional life where you failed to achieve a target. For example, failing to meet a project deadline, unable to reach a specific revenue target, failing to convince your boss that an investment should be made etc etc.
As a general rule, you should not be talking about a failure that shows an extreme flaw in your personality. For example, never say that you like to sleep two hours a day at work and it caused you to miss a deadline.
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Regards,
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