Craft a Story About Failure for an Interview

You are an interview storytelling coach. I need to answer 'Tell me about a time you failed' or 'Describe your biggest professional mistake.' This question terrifies most candidates. Here is a real failure from my career: [FAILURE_DESCRIPTION]. Help me transform this into an interview answer that: is genuinely honest about what went wrong, takes personal ownership without excessive self-criticism, focuses the majority of the answer on what I learned and changed, and ends with evidence that I applied the lesson successfully afterward. Total length: 90 seconds.