Subant在没有build.xml的目录上给我“无效文件...”

Question

我正在尝试使用subant。我有一个带有build.xml的子目录，有些则没有。

我的任务是：

    <target name="buildCatapultSamples" description="Builds the catapult samples using the generated jars.">
        <echo>Building catapult samples in ${base.compilesamples.src.dir}</echo>

        <mkdir dir="${base.compilesamples.src.dir}"/>
        <copy todir="${base.compilesamples.src.dir}">
            <fileset dir="setup_files/demo/Samples/Java"/>
        </copy>

        <subant target="build" buildpath="${base.compilesamples.src.dir}">
            <fileset dir="${base.compilesamples.src.dir}" includes="*/build.xml"/>
        </subant>

  </target>

在我没有build.xml的第一个目录中：

BUILD FAILED
C:\git\Jenova\setup\Engine\JavaEngine\build.xml:231: Invalid file: C:\git\Jenova\setup\Engine\JavaEngine\working\src_samples\build.xml
        at org.apache.tools.ant.taskdefs.SubAnt.execute(SubAnt.java:287)
        at org.apache.tools.ant.taskdefs.SubAnt.execute(SubAnt.java:221)
        at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
        at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
        at org.apache.tools.ant.Task.perform(Task.java:348)
        at org.apache.tools.ant.Target.execute(Target.java:435)
        at org.apache.tools.ant.Target.performTasks(Target.java:456)
        at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1393)
        at org.apache.tools.ant.Project.executeTarget(Project.java:1364)
        at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
        at org.apache.tools.ant.Project.executeTargets(Project.java:1248)
        at org.apache.tools.ant.Main.runBuild(Main.java:851)
        at org.apache.tools.ant.Main.startAnt(Main.java:235)
        at org.apache.tools.ant.launch.Launcher.run(Launcher.java:280)
        at org.apache.tools.ant.launch.Launcher.main(Launcher.java:109)

我在做什么错了？