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java.lang.NullPointerException: 	at org.apache.tools.ant.util.ResourceUtils.copyResource(ResourceUtils.java:439)	at org.apache.tools.ant.util.FileUtils.copyFile(FileUtils.java:559)	at org.apache.tools.ant.util.FileUtils.copyFile(FileUtils.java:519)	at org.apache.tools.ant.util.FileUtils.copyFile(FileUtils.java:480)	at org.apache.tools.ant.util.FileUtils.copyFile(FileUtils.java:443)	at org.apache.tools.ant.util.FileUtils.copyFile(FileUtils.java:409)	at org.apache.tools.ant.util.FileUtils.copyFile(FileUtils.java:384)	at org.apache.tools.ant.util.FileUtils.copyFile(FileUtils.java:322)	at org.netbeans.modules.java.j2seproject.copylibstask.CopyLibs.execute(CopyLibs.java:206)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)	at sun.reflect.GeneratedMethodAccessor103.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	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.taskdefs.Sequential.execute(Sequential.java:68)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)	at sun.reflect.GeneratedMethodAccessor103.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	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.taskdefs.MacroInstance.execute(MacroInstance.java:396)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)	at sun.reflect.GeneratedMethodAccessor103.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	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.module.bridge.impl.BridgeImpl.run(BridgeImpl.java:286)	at org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:555)	at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:153)