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java.lang.NullPointerException: 	at org.apache.tools.ant.IntrospectionHelper.supportsNestedElement(IntrospectionHelper.java:642)	at org.apache.tools.ant.UnknownElement.handleChild(UnknownElement.java:544)	at org.apache.tools.ant.UnknownElement.handleChildren(UnknownElement.java:326)	at org.apache.tools.ant.UnknownElement.configure(UnknownElement.java:182)	at org.apache.tools.ant.UnknownElement.maybeConfigure(UnknownElement.java:158)	at org.apache.tools.ant.Task.getReplacement(Task.java:433)	at org.apache.tools.ant.Task.perform(Task.java:383)	at org.apache.tools.ant.Target.execute(Target.java:341)	at org.apache.tools.ant.Target.performTasks(Target.java:369)	at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)	at org.apache.tools.ant.Project.executeTarget(Project.java:1185)	at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:40)	at org.apache.tools.ant.Project.executeTargets(Project.java:1068)	at org.apache.tools.ant.Main.runBuild(Main.java:668)	at org.apache.tools.ant.Main.startAnt(Main.java:187)	at org.apache.tools.ant.launch.Launcher.run(Launcher.java:246)	at org.apache.tools.ant.launch.Launcher.main(Launcher.java:67)