StartBuildActivityTask cannot be found

I am using RAD 7.5.5.2, RTC and websphere v6.1
I am new to Maven and jazz script. I had downloaded the project from repository as
File>Accept Team Invitation after that i downloaded the entire project.I installed the M2Eclipse on top of RAD also.

At last all the dependencies are properly downloaded.
There is pom.xml file in my project from inside which we had invoked
<taskdef>
When i try to clean and build the project from Project tab>clean

Console will show me an error like as below:-

12/16/10 8:13:25 PM GMT+05:30: Build errors for PPCEAR; org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-antrun-plugin:1.3:run (compile) on project PPCEAR: An Ant BuildException has occured: taskdef class com.ibm.team.build.ant.task.StartBuildActivityTask cannot be found

I don't know some task is missing from my pom file.
After that i had downloaded buildtoolkit from jazz site and put all the jars from buildengine into project classpath. But i am getting same error during build.

I am trying to remove this task error by some way but it is still coming please help for above task

Thanks

<project>



..... The real stuff here



 <taskdef name="artifactFilePublisher"

   classname="com.ibm.team.build.ant.task.ArtifactFilePublisherTask" />

  <taskdef name="artifactLinkPublisher"

    classname="com.ibm.team.build.ant.task.ArtifactLinkPublisherTask" />

 <taskdef name="buildResultPublisher"

    classname="com.ibm.team.build.ant.task.BuildResultPublisherTask" />

  <taskdef name="filePublisher"

   classname="com.ibm.team.build.ant.task.FilePublisherTask" />

  <taskdef name="jdtCompileLogPublisher"

    classname="com.ibm.team.build.ant.task.JdtCompileLogPublisherTask" />





</project>

This tutorial is really very useful to know how to start new builds.In my pom.xml file I saw it is already mentioned like as below:-

<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-antrun-plugin</artifactId>
<inherited>true</inherited>
<executions>
<execution>
<id>compile</id>
<phase>compile</phase>
<configuration>
<tasks>
<taskdef> <startBuildActivity>

From the above pom file startBuildActivity is clearly mentioned as classname com.ibm.team.build.ant.task.StartBuildActivityTask

I had also seen in ant Tasks that this task is already there in ANT Tasks lists. I had also tried taking build-ant.jar from C:\Program Files\IBM\SDP\configuration\org.eclipse.osgi\bundles\916\1\.cp\ant_tasks in build path.
But the above error is still coming.

previously i had also tried importing tasks from BuildToolkitTaskDefs.xml and put all jars from that directory into classpath. But unfortunately it is giving me StartBuildActivityTask cannot be found.

Please give your views on above.

Thanks

 <taskdef name="artifactFilePublisher" classname="com.ibm.team.build.ant.task.ArtifactFilePublisherTask" />

  <taskdef name="artifactLinkPublisher" classname="com.ibm.team.build.ant.task.ArtifactLinkPublisherTask" />

 <taskdef name="buildResultPublisher" classname="com.ibm.team.build.ant.task.BuildResultPublisherTask" />

  <taskdef name="filePublisher" classname="com.ibm.team.build.ant.task.FilePublisherTask" />

  <taskdef name="jdtCompileLogPublisher" classname="com.ibm.team.build.ant.task.JdtCompileLogPublisherTask" />

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I am also experiencing the same "StartBuildActivityTask cannot be found," but only while using Maven 3. I have seen references to classpath inheritance issues with the maven-antrun-plugin under Maven 3, but I have not been able to isolate the issue yet. Any help would be greatly appreciated.

<plugin>

        <artifactId>maven-antrun-plugin</artifactId>

        <executions>

          <execution>

            <phase>compile</phase>

            <configuration>

              <tasks>

                <taskdef name="startBuildActivity" classname="com.ibm.team.build.ant.task.StartBuildActivityTask" />



                   <classpath>

                      <fileset dir="C:\jazz\buildsystem\buildtoolkit">

                         <include name="*.jar" />

                      </fileset>

                   </classpath>



                    <!-- Replace ADMIN with your real credentials. -->

	            <startBuildActivity repositoryAddress="${repositoryAddress}"

		                       userId="ADMIN"

		                       password="ADMIN"

		                       buildResultUUID="${buildResultUUID}"

		                       autoComplete="true"

		                       label="compiling..." />

              </tasks>

            </configuration>

            <goals>

                <goal>run</goal>

            </goals>

          </execution>

        </executions>

      </plugin>