求助：Maven构建java项目时出错

Question

这个项目以前是用Ant构建的，现在转用Maven了。报错如下：An Ant BuildException has occured: You must not specify nested elements when using refid.
构建过程如下：
这个项目的pom.xml文件如下：

 <project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>aopmetrics</groupId>
  <artifactId>aopmetrics</artifactId>
  <version>0.3</version>
  <name>AOP Metrics</name> 

  <url>http://aopmetrics.tigris.org</url>
  <inceptionYear>2005</inceptionYear> 

  <issueManagement>
    <system>Scarab</system>
    <url>http://aopmetrics.tigris.org/servlets/ProjectIssues</url> 
  </issueManagement> 

  <mailingLists>
    <mailingList>
      <name>[e-mail]</name>
      <subscribe>[e-mail]</subscribe>
      <unsubscribe>[e-mail]</unsubscribe>
      <post>[e-mail]</post>
      <archive>http://aopmetrics.tigris.org/servlets/SummarizeList?listName=dev</archive>
    </mailingList>
    <mailingList>
      <name>[e-mail]</name>
      <subscribe>[e-mail]</subscribe>
      <unsubscribe>[e-mail]</unsubscribe>
      <post>[e-mail]</post>
      <archive>http://aopmetrics.tigris.org/servlets/SummarizeList?listName=cvs</archive>
    </mailingList>
    <mailingList>
      <name>[e-mail]</name>
      <subscribe>[e-mail]</subscribe>
      <unsubscribe>[e-mail]</unsubscribe>
      <post>[e-mail]</post>
      <archive>http://aopmetrics.tigris.org/servlets/SummarizeList?listName=issues</archive>
    </mailingList>
    <mailingList>
      <name>[e-mail]</name>
      <subscribe>[e-mail]</subscribe>
      <unsubscribe>[e-mail]</unsubscribe>
      <post>[e-mail]</post>
      <archive>http://aopmetrics.tigris.org/servlets/SummarizeList?listName=users</archive>
    </mailingList>
    <mailingList>
      <name>[e-mail]</name>
      <subscribe>[e-mail]</subscribe>
      <unsubscribe>[e-mail]</unsubscribe>
      <post>[e-mail]</post>
      <archive>http://aopmetrics.tigris.org/servlets/SummarizeList?listName=announce</archive>
    </mailingList>
  </mailingLists>

  <developers>
    <developer>
      <id>misto</id>
      <name>Michal Stochmialek</name>
      <email>[e-mail]</email>
      <url>http://misto.e-informatyka.pl</url>
    </developer> 
  </developers> 


  <dependencies>
    <dependency>
      <groupId>ant</groupId>
      <artifactId>ant</artifactId>
      <version>1.6.5</version>
    </dependency>
    <dependency>
      <groupId>xpp3</groupId>
      <artifactId>xpp3</artifactId>
      <version>1.1.3.4-RC8</version>
    </dependency>
    <dependency>
      <groupId>xstream</groupId>
      <artifactId>xstream</artifactId>
      <version>1.1.1</version>
    </dependency> 
    <dependency>
      <groupId>poi</groupId>
      <artifactId>poi</artifactId>
      <version>2.5.1-final-20040804</version>
    </dependency>
    <dependency>
      <groupId>aspectj</groupId>
      <artifactId>aspectjtools</artifactId>
      <version>1.5.1</version>
    </dependency> 
    <dependency>
      <groupId>aspectj</groupId>
      <artifactId>aspectjrt</artifactId>
      <version>1.5.1</version>
    </dependency> 
    <dependency>
      <groupId>commons-cli</groupId>
      <artifactId>commons-cli</artifactId>
      <version>1.0</version>
    </dependency> 
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope> 
    </dependency> 
  </dependencies> 

  <build>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
          <source>1.5</source> 
          <target>1.5</target> 
        </configuration> 
      </plugin> 
      <plugin>
        <artifactId>maven-jar-plugin</artifactId>
        <configuration>
          <archive>
            <manifest>
              <mainClass>org.tigris.aopmetrics.AopMetricsCLI</mainClass> 
              <addClasspath>true</addClasspath>
            </manifest> 
         </archive> 
        </configuration> 
      </plugin>  
      <plugin>
        <artifactId>maven-surefire-plugin</artifactId>
        <configuration>
          <skip>true</skip>
          <systemProperties>
            <property>
              <name>tests.workdir</name>
              <value>target/workdir</value>
            </property>
          </systemProperties> 
        </configuration> 
      </plugin> 
    </plugins> 
  </build>

  <profiles>
    <profile> 
      <id>dist</id>
      <build>
       <defaultGoal>assembly:assembly</defaultGoal> 
       <plugins> 
          <plugin>
            <artifactId>maven-antrun-plugin</artifactId>
            <executions>
              <execution>
                <id>aopmetrics-on-aopmetrics</id>
                <phase>package</phase> 
                <configuration>
                  <tasks>
                    <taskdef name="aopmetrics" classname="org.tigris.aopmetrics.AopMetricsTask">
                      <classpath refid="maven.compile.classpath"/>
                      <classpath refid="maven.test.classpath"/>
                      <classpath location="${project.build.directory}/${project.build.finalName}.jar"/>
                    </taskdef>

                    <aopmetrics workdir="${project.build.directory}/work" sourcelevel="1.5" export="xls"
                        resultsfile="${project.build.directory}/aop-metrics-results.xls">
                      <fileset dir="src/main/java" includes="**/*.java"/>
                      <fileset dir="src/test/java" includes="**/*.java"/>
                      <classpath refid="maven.compile.classpath"/>
                      <classpath refid="maven.test.classpath"/>
                    </aopmetrics> 
                  </tasks> 
                </configuration> 
                <goals>
                  <goal>run</goal>
                </goals>
              </execution>
            </executions>
          </plugin> 
          <plugin>
            <artifactId>maven-javadoc-plugin</artifactId>
            <executions>
              <execution>
                <id>javadoc-gen</id>
                <phase>package</phase> 
                <goals>
                  <goal>javadoc</goal>
                </goals>
              </execution>
            </executions>
          </plugin> 
          <plugin>
            <artifactId>maven-assembly-plugin</artifactId>
            <configuration>
              <descriptors>
                <descriptor>src/main/assembly/bin.xml</descriptor>
                <descriptor>src/main/assembly/src.xml</descriptor>
              </descriptors>  
            </configuration>
          </plugin> 
        </plugins> 
      </build> 
    </profile> 
  </profiles> 
</project>

这个项目很急用，我是新手，跪求各位大神。