This is similar to the tell us about your weaknesses question. You can’t say you have none, and you can’t say something fake like I work too hard. You need to be honest here with parameters: Prepare your answer so it comes across in a positive, productive way and not as bashing your former employer. Choose things that are about the job itself preferably, not your terrible boss, so you’re focusing on things that don’t come across as talking badly about people, which isn’t necessary or helpful. Things like the lack of structure or process is an example of something you could say. Or the lack of direction for your department.