Just tested it on a not rooted phone Lollipop.
Works perfectly when enabled the write permission. Without this permission it gives exactly the error you posted. Are you using APDE just using this single permission?
Edit: I just realized that you misunderstood when I said “You can edit your code”. I meant the code of your post, not the IDE, because it is somewhat annoying having to scroll so much. The preview mode really has the <> button.
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