This is an alternative form of the classic strengths/weaknesses question. This question implies that everyone has weaknesses and it is an accepted part of the company's culture. That said, if you can't demonstrate that you are self-aware and you are working to improve on something that is a known struggle, this question can be a trap.

Answer authentically. Speak to something that you do actually struggle with and how you've worked to improve in that area. Avoid trying to show that your weakness is actually a strength (i.e. I care too much about my work and this can cause delays). This doesn't resonate as an authentic answer.

One thing I struggle with is a tendency to jump into execution versus taking the time to fully understand what a client needs or what they want to accomplish. This is why I believe using a creative brief is so important. It enables me to slow down and make sure I'm considering all facets of a project before I jump straight into design execution.