I’ve seen similar questions on SO about this error, but I haven’t been able to fix my problem below. The situation The code at this link works: https://codesandbox.io/s/frosty-water-118xp?file=/src/App.js However, what I don’t like about it is that I need to repeat myself in the ‘slides’ array, by outlining the slide structure again and again (as you can see from lines