java模块X的多个工件被检索到ApacheIvy中的同一个文件中？

Question

当我使用ant构建时，我得到了以下错误：

BUILD FAILED
/Users/rajeevprasanna/Desktop/Nutch/nutch-release-1.14/build.xml:116: The following error occurred while executing this line:
/Users/rajeevprasanna/Desktop/Nutch/nutch-release-1.14/src/plugin/build.xml:34: The following error occurred while executing this line:
/Users/rajeevprasanna/Desktop/Nutch/nutch-release-1.14/src/plugin/build-plugin.xml:230: impossible to ivy retrieve: java.lang.RuntimeException: problem during retrieve of org.apache.nutch#lib-selenium: java.lang.RuntimeException: Multiple artifacts of the module commons-codec#commons-codec;1.10 are retrieved to the same file! Update the retrieve pattern  to fix this error.
    at org.apache.ivy.core.retrieve.RetrieveEngine.retrieve(RetrieveEngine.java:206)
    at org.apache.ivy.Ivy.retrieve(Ivy.java:540)
    at org.apache.ivy.ant.IvyRetrieve.doExecute(IvyRetrieve.java:59)
    at org.apache.ivy.ant.IvyTask.execute(IvyTask.java:277)
    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)

我已经按照这个post设置了配置：

<target name="resolve-default" depends="clean-default-lib" description="--> resolve and retrieve dependencies with ivy">
    <ivy:resolve file="${ivy.file}" conf="default" log="download-only"/>
    <ivy:retrieve pattern="${build.lib.dir}/[artifact]-[type]-[revision].[ext]" symlink="false" log="quiet"/>
    <antcall target="copy-libs"/>
  </target>

  <target name="resolve-test" depends="clean-test-lib, init" description="--> resolve and retrieve dependencies with ivy">
    <ivy:resolve file="${ivy.file}" conf="test" log="download-only"/>
    <ivy:retrieve pattern="${test.build.lib.dir}/[artifact]-[type]-[revision].[ext]" symlink="false" log="quiet"/>
    <antcall target="copy-libs"/>
  </target>

commons对编解码器的依赖性如下所示。xml:

<dependency org="commons-codec" name="commons-codec" rev="1.10" conf="*->default" />

有人能告诉我我做错了什么吗