Most people aren't ready to admit what they're bad at. When I was a manager recruiter in another life, one of the key litmus test questions was getting a cogent and (perceptibly honest) answer to the unanswerable questions:

"Tell me about a time in a past assignment where you seriously messed up and had to be reprimanded and/or corrected? Tell me about how you felt and what you did about that reprimand?"

Nobody in management has EVER made it to being a manager without screwing something up. You can say you haven't, but I won't believe you. Mess-ups are natural and a part of growth. Most people cover up for them, deny them and aren't ready to answer these questions. A truly mature manager will admit it and answer honestly. Only a very amazing liar will be able to come up with something on the fly (good for them), the rest of us will have to access memory and be direct about it.