java.lang.ClassCastException: This exception has no message.

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java.lang.ClassCastException:
at org.apache.tools.ant.loader.AntClassLoader2.addPathFile(AntClassLoader2.java:279)
at org.apache.tools.ant.AntClassLoader.addPathElement(AntClassLoader.java:481)
at org.apache.tools.ant.AntClassLoader.setClassPath(AntClassLoader.java:381)
at org.apache.tools.ant.Project.createClassLoader(Project.java:305)
at org.apache.tools.ant.taskdefs.Definer.createLoader(Definer.java:328)
at org.apache.tools.ant.taskdefs.Definer.execute(Definer.java:178)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:185)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:309)
at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:128)
at org.apache.tools.ant.ProjectHelper.configureProject(ProjectHelper.java:119)
at org.apache.tools.ant.Main.runBuild(Main.java:595)
at org.apache.tools.ant.Main.start(Main.java:198)

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