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This error usually means that the icons variable is not the type that you expect it to be.
Often it’s because it’s an array. In that case, a string can’t be used to index the type of the array because a number is needed to do that. e.g. icons[2].
I would try console logging the icons variable and seeing what comes out, from there you can figure out what you need to use to index it 🙂
I hope this helps!
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Source:stackexchange.com