1. Is the import correct and without typos?

Make sure the file where you're using the widget has this:

dart

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import 'package:your_project/widgets/image_picker_overlay_widget.dart'; 
Or if it's in the same lib directory:

dart

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import 'image_picker_overlay_widget.dart'; 
Sometimes a wrong path or circular import can cause Flutter to see the class as not being a Widget.