GWT Module XXX not found in project sources or resources

I have the widgetset compiled with the Maven goals: vaadin:update-widgetset gwt:compile. So the pom.xml and web.xml files configurations should be fine.

I'm a Maven newbie and this is my first Maven project.

After compilation the compiled code shows in src/main/webapp/VAADIN/widgetsets folder. When I try to run the install goal the error shows:

Failed to execute goal org.codehaus.mojo:gwt-maven-plugin:2.2.0:resources (default) on project Validation-Manager-Web: GWT Module com.pantar.widget.graph.GraphWidget not found in project sources or resources.

Just in case here are the relevant files:

**POM:**

<plugins>
                <!-- Compiles your custom GWT components with the GWT compiler -->
                <!-- A hosted mode browser for client-side widget debugging can be run with the goal gwt:run after uncommenting the 
                correct line below. A remote debugger can then be connected to port 8998. Note that e.g. a Jetty server should be running 
                with the server side parts - use the goal jetty:run . -->
                <plugin>
                    <groupId>org.codehaus.mojo</groupId>
                    <artifactId>gwt-maven-plugin</artifactId>
                    <version>${gwt.plugin.version}</version>
                    <configuration>
                        <!-- if you don't specify any modules, the plugin will find them -->
                        <modules> 
                            <module>com.pantar.widget.graph.GraphWidget</module> 
                        </modules>
                        <webappDirectory>src/main/webapp/VAADIN/widgetsets</webappDirectory>
                        <!-- On Mac running Snow Leopard, add "-d32" -->
                        <!-- This causes error messages (but build works) in phase "package": two processes would use the same debug 
                        port -->
                        <!--extraJvmArgs>-Xmx512M -Xss1024k -Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=8998</extraJvmArgs -->
                        <extraJvmArgs>-Xmx512M -Xss1024k</extraJvmArgs>
                        <runTarget>Validation-Manager-Web</runTarget>
                        <hostedWebapp>${project.build.directory}/${project.build.finalName}</hostedWebapp>
                        <noServer>true</noServer>
                        <port>8084</port>
                        <compileReport>false</compileReport>
                    </configuration>
                    <executions>
                        <execution>
                            <goals>
                                <goal>resources</goal>
                                <goal>compile</goal>
                            </goals>
                        </execution>
                    </executions>
                    <dependencies>
                        <dependency>
                            <groupId>com.google.gwt</groupId>
                            <artifactId>gwt-dev</artifactId>
                            <version>${gwt.version}</version>
                        </dependency>
                        <dependency>
                            <groupId>com.google.gwt</groupId>
                            <artifactId>gwt-user</artifactId>
                            <version>${gwt.version}</version>
                        </dependency>
                    </dependencies>
                </plugin>
                <plugin>
                    <groupId>com.vaadin</groupId>
                    <artifactId>vaadin-maven-plugin</artifactId>
                    <version>1.0.2</version>
                    <executions>
                        <execution>
                            <configuration>
                                <modules> 
                                    <module>com.pantar.widget.graph.GraphWidget</module> 
                                </modules>
                            </configuration>
                            <goals>
                                <goal>update-widgetset</goal>
                            </goals>
                        </execution>
                    </executions>
                </plugin>

Any ideas?

Thanks in advance!

Fixed it by adding an empty gwt.xml file with this contents:

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 1.7.0//EN" "http://google-web-toolkit.googlecode.com/svn/tags/1.7.0/distro-source/core/src/gwt-module.dtd">
    <module>
        <inherits name="com.vaadin.terminal.gwt.DefaultWidgetSet" />
    
        <inherits name="<module>" />
    </module>