Compiling visualizationsForVaadin WidgetSet

I am trying to user visualizationsForVaadin add-on. However, in the browser I get an Exception that the widgetSet is not compiled. So now I am trying to compile the widgetSet, but still get some errors. Here is my configuration:

I have a package com.sample.ui.widgetset with a XML file WidgetSet.xml containg this:

<?xml version="1.0" encoding="UTF-8"?>
    "-//Google Inc.//DTD Google Web Toolkit 1.7.0//EN"
    <inherits name="com.vaadin.terminal.gwt.DefaultWidgetSet" />

    <inherits name="org.vaadin.vaadinvisualizations.widgetset.VaadinvisualizationApplicationWidgetset" />

I am using maven with following dependencies:


than I am running mvn clean compile vaadin:update-widgetset gwt:compile and get many JAVA errors like some fields cannot be resolved, or imports, etc… Can somebody please give a right configurations for using the add on? What dependencies do I have to include? And what configuration do I have to do? Thanks.