GWT 2.5.1 mvn install error “Rebind result must be a class”

Problem: I run mvn gwt:compile on my GWT 2.5.1 project that I built with the gwt-maven-plugin and get the error Rebind result must be a class in all the classes that I have that extends CssResource.

This class is one of them:

public interface MainShellStyle extends CssResource{        public static final MainShellStyle INSTANCE =  GWT.create(MainShellStyle.class);        public String txtCompanyName();      public String txtCompanySlogan();      public String txtCompanyMessage();      public String topRibbon();      public String mainMenu();        public String btnEditContacts();      public String btnEditGuestBook();      public String btnEditPictures();      public String btnEditHome();  }

My pom.xml is the following:

<!-- Dependecies --!>  <build>            <!-- Generate compiled stuff in the folder used for development mode -->          <outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes</outputDirectory>            <!-- Plugins -->            <plugins>                <plugin>                  <groupId>org.apache.maven.plugins</groupId>                  <artifactId>maven-war-plugin</artifactId>                  <version>2.4</version>                  <configuration>                      <archiveClasses>true</archiveClasses>                      <webResources>                          <!-- in order to interpolate version from pom into appengine-web.xml -->                          <resource>                              <directory>${basedir}/src/main/webapp/WEB-INF</directory>                              <filtering>true</filtering>                              <targetPath>WEB-INF</targetPath>                          </resource>                            <resource>                              <directory>${basedir}/src/main/webapp/js</directory>                              <filtering>false</filtering>                              <targetPath>js</targetPath>                          </resource>                      </webResources>                  </configuration>              </plugin>                <plugin>                  <groupId>org.codehaus.mojo</groupId>                  <artifactId>gwt-maven-plugin</artifactId>                  <version>${gwt.version}</version>                    <!-- Plugin configuration. There are many available options, see gwt-maven-plugin                       documentation at codehaus.org -->                  <configuration>                      <!-- URL that should be automatically opened in the GWT shell (gwt:run). -->                      <runTarget>Webmetalmore.html</runTarget>                      <!-- Ask GWT to create the Story of Your Compile (SOYC) (gwt:compile) -->                      <compileReport>true</compileReport>                      <module>com.ohapp.webmetalmore.Webmetalmore</module>                      <logLevel>INFO</logLevel>                      <style>${gwt.style}</style>                        <copyWebapp>true</copyWebapp>                  </configuration>                    <dependencies>                      <dependency>                          <groupId>com.google.gwt</groupId>                          <artifactId>gwt-user</artifactId>                          <version>${gwt.version}</version>                      </dependency>                      <dependency>                          <groupId>com.google.gwt</groupId>                          <artifactId>gwt-dev</artifactId>                          <version>${gwt.version}</version>                      </dependency>                  </dependencies>                  <!-- JS is only needed in the package phase, this speeds up testing -->                  <executions>                      <execution>                          <phase>prepare-package</phase>                          <goals>                              <goal>compile</goal>                          </goals>                      </execution>                  </executions>              </plugin>            </plugins>            <!-- End Plugins -->        </build>  

It's the first time I'm compiling an GWT project. Anyone knows what am I doing wrong?

I would really appreciate your help.

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