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I came across this example to get the Size/Position of a widget: https://medium.com/@diegoveloper/flutter-widget-size-and-position-b0a9ffed9407 what is wrong with my code? I get the error: The following NoSuchMethodError was thrown while handling a gesture: I/flutter ( 8566): The method 'findRenderObject' was called on null. I/flutter ( 8566): ...

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