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Just placing in a new tab doesn't work e.g. https://i.imgur.com/VwUGEyH.png
Putting in the only tab of a sketch gives this error: https://i.imgur.com/P5Wij6R.png
Answers
Can you please be more specific? Can you put together a very simple example and show us exactly what you're doing?
Does your sketch have setup() & draw() too, besides your classes? L-)