Hi Artur, I followed the "how to use", but I get the Client error: "Widgets

Directory Widget Set Optimizer
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Hi Artur,
I followed the “how to use”, but I get the Client error:
“Widgetset does not contain implementation for org.vaadin.artur.widgetsetoptimizer.WidgetSetOptimizer”
Is it still working with the latest release 7.1.6?
Thanks
Mario