ant run error with testing statelessSession from weblogic example

Hi,

I am trying to run statelessSession from weblogic example, but I got this error message when I tried 'ant run' command. My ant command works fine and I didn't change any directories.
++++++++++++++++++++++

C:\bea81\weblogic81\samples\server\examples\src\examples\ejb20\basic\statelessSe
ssion>ant run
Buildfile: build.xml

run:

     [java] Beginning statelessSession.Client...

     [java] The client was unable to lookup the EJBHome.  Please make sure
     [java] javax.naming.NameNotFoundException: Unable to resolve 'ejb20-statele
ssSession-TraderHome' Resolved ; remaining name 'ejb20-statelessSession-TraderHo
me'
     [java]     at weblogic.rjvm.BasicOutboundRequest.sendReceive(BasicOutboundR
equest.java:108)
     [java] that you have deployed the ejb with the JNDI name ejb20-statelessSes
sion-TraderHome on the WebLogic server at t3://localhost:7001
     [java]     at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwar
eRemoteRef.java:284)
     [java] Unable to look up the beans home: Unable to resolve 'ejb20-stateless
Session-TraderHome' Resolved
     [java]     at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwar
eRemoteRef.java:244)
     [java]     at weblogic.jndi.internal.ServerNamingNode_812_WLStub.lookup(Unk
nown Source)
     [java]     at weblogic.jndi.internal.WLContextImpl.lookup(WLContextImpl.jav
a:343)
     [java]     at weblogic.jndi.internal.WLContextImpl.lookup(WLContextImpl.jav
a:336)
     [java]     at javax.naming.InitialContext.lookup(InitialContext.java:347)
     [java]     at examples.ejb20.basic.statelessSession.Client.lookupHome(Clien
t.java:118)
     [java]     at examples.ejb20.basic.statelessSession.Client.<init>(Client.ja
va:32)
     [java]     at examples.ejb20.basic.statelessSession.Client.main(Client.java
:59)
     [java] Caused by: javax.naming.NameNotFoundException: Unable to resolve 'ej
b20-statelessSession-TraderHome' Resolved
     [java]     at weblogic.jndi.internal.BasicNamingNode.newNameNotFoundExcepti
on(BasicNamingNode.java:858)
     [java]     at weblogic.jndi.internal.BasicNamingNode.lookupHere(BasicNaming
Node.java:230)
     [java]     at weblogic.jndi.internal.ServerNamingNode.lookupHere(ServerNami
ngNode.java:154)
     [java]     at weblogic.jndi.internal.BasicNamingNode.lookup(BasicNamingNode
.java:188)
     [java]     at weblogic.jndi.internal.RootNamingNode_WLSkel.invoke(Unknown S
ource)
     [java]     at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.ja
va:477)
     [java]     at weblogic.rmi.cluster.ReplicaAwareServerRef.invoke(ReplicaAwar
eServerRef.java:108)
     [java]     at weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.jav
a:420)
     [java]     at weblogic.security.acl.internal.AuthenticatedSubject.doAs(Auth
enticatedSubject.java:353)
     [java]     at weblogic.security.service.SecurityManager.runAs(SecurityManag
er.java:144)
     [java]     at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServe
rRef.java:415)
     [java]     at weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecut
eRequest.java:30)
     [java]     at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)

     [java]     at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)
     [java] Exception in thread "main"

BUILD FAILED
file:C:/bea81/weblogic81/samples/server/examples/src/examples/ejb20/basic/statel
essSession/build.xml:76: Java returned: 1

Total time: 4 seconds

++++++++++++++++
this is the build.xml file
++++++++++++++
<project name="ejb20-basic-statelessSession" default="all" basedir=".">

  <!-- set global properties for this build -->
  <property environment="env"/>
  <property file="../../../../examples.properties"/>
  <property name="build.compiler" value="${compiler}"/>
  <property name="source" value="."/>
  <property name="build" value="${source}/build"/>
  <property name="dist" value="${source}/dist"/>

  <target name="all" depends="clean, init, compile_ejb, jar.ejb, appc, ear_app,
    compile_client"/>

  <target name="init">
    <!-- Create the time stamp -->
    <tstamp/>
    <!-- Create the build directory structure used by compile
    and copy the deployment descriptors into it-->
    <mkdir dir="${build}"/>
    <mkdir dir="${build}/META-INF"/>
    <mkdir dir="${dist}"/>
    <copy todir="${build}/META-INF">
      <fileset dir="${source}">
        <include name="ejb-jar.xml"/>
        <include name="weblogic-ejb-jar.xml"/>
      </fileset>
    </copy>
  </target>

  <!-- Compile ejb classes into the build directory (jar preparation) -->
  <target name="compile_ejb">
    <javac srcdir="${source}" destdir="${build}"
       includes="Trader.java, TraderHome.java, TradeResult.java,
         TraderBean.java"/>
  </target>

  <!-- Update ejb jar file or create it if it doesn't exist, including XML
    deployment descriptors -->
  <target name="jar.ejb" depends="compile_ejb">
    <jar jarfile="${dist}/ejb20_basic_statelessSession.jar"
      basedir="${build}"
      update="yes">
    </jar>
  </target>

  <target name="appc" depends="jar.ejb">
    <wlappc debug="${debug}"
      source="${dist}/ejb20_basic_statelessSession.jar"
      />
  </target>


  <!-- Put the ejb into an ear, to be deployed from the ${apps.dir} dir -->
  <target name="ear_app" depends="jar.ejb">
    <ear earfile="${apps.dir}/ejb20_basic_statelessSession.ear" appxml="${source}/application.xml">
      <fileset dir="${dist}" includes="ejb20_basic_statelessSession.jar"/>
    </ear>
  </target>

  <!-- Compile client app into the clientclasses directory, and move the client jar file (created by appc) there as well -->
  <target name="compile_client">
    <move file="${user.dir}/ejb20_basic_statelessSession_client.jar" tofile="${client.classes.dir}/ejb20_basic_statelessSession_client.jar"/>
    <javac srcdir="${source}"
      destdir="${client.classes.dir}"
      includes="Client.java"
      classpath="${ex.classpath};${client.classes.dir}/ejb20_basic_statelessSession_client.jar"
    />
  </target>

  <target name="clean">
    <delete dir="${build}"/>
  </target>

  <!-- Run the example -->
  <target name="run">
  <java classname="examples.ejb20.basic.statelessSession.Client" fork="yes" failonerror="true">
    <arg value="t3://localhost:${port}"/>
    <classpath>
      <pathelement path="${ex.classpath};${client.classes.dir}/ejb20_basic_statelessSession_client.jar"/>
    </classpath>
  </java>
  </target>

</project>
++++++++++++++++++=
Of course, I started the weblogic server before I ran.

thanks in advance.