Netbean的重构功能报错，请问是何原因？

例如：提取超类等，经常有一下报错，是因为我的Netbean没花钱买的盗版吗?
出现 org.openide.util.RequestProcessor$SlowItem 异常。
请访问 http://www.netbeans.org/community/issues.html 以报告此异常，
请包含 messages.log 文件的副本。
messages.log 文件位于 C:\Documents and Settings\Administrator\.netbeans\6.8m2\var\log 文件夹中。
详细报错内容：
java.lang.UnsupportedOperationException: Not supported yet.
at org.netbeans.modules.java.source.transform.FieldGroupTree.accept(FieldGroupTree.java:75)
at org.netbeans.modules.java.source.pretty.VeryPretty.doAccept(VeryPretty.java:256)
at org.netbeans.modules.java.source.pretty.VeryPretty.print(VeryPretty.java:248)
at org.netbeans.modules.java.source.save.CasualDiff.diffList(CasualDiff.java:2377)
at org.netbeans.modules.java.source.save.CasualDiff.diffClassDef(CasualDiff.java:468)
at org.netbeans.modules.java.source.save.CasualDiff.diffTreeImpl(CasualDiff.java:2705)
at org.netbeans.modules.java.source.save.CasualDiff.diffTree(CasualDiff.java:2658)
at org.netbeans.modules.java.source.save.CasualDiff.diffTree(CasualDiff.java:2646)
at org.netbeans.modules.java.source.save.CasualDiff.diffList(CasualDiff.java:2428)
at org.netbeans.modules.java.source.save.CasualDiff.diffTopLevel(CasualDiff.java:273)
at org.netbeans.modules.java.source.save.CasualDiff.diffTreeImpl(CasualDiff.java:2699)
at org.netbeans.modules.java.source.save.CasualDiff.diffTree(CasualDiff.java:2658)
at org.netbeans.modules.java.source.save.CasualDiff.diff(CasualDiff.java:191)
at org.netbeans.api.java.source.WorkingCopy.processCurrentCompilationUnit(WorkingCopy.java:444)
at org.netbeans.api.java.source.WorkingCopy.getChanges(WorkingCopy.java:505)
at org.netbeans.api.java.source.JavaSource$1.run(JavaSource.java:657)
at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:129)
at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:113)
at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:190)
at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:99)
at org.netbeans.api.java.source.JavaSource.runModificationTask(JavaSource.java:669)
at org.netbeans.modules.refactoring.java.plugins.ExtractSuperclassRefactoringPlugin$CreateSuperclassElement.performChange(ExtractSuperclassRefactoringPlugin.java:391)
at org.netbeans.modules.refactoring.api.RefactoringSession.doRefactoring(RefactoringSession.java:118)
at org.netbeans.modules.refactoring.spi.impl.ParametersPanel$8.run(ParametersPanel.java:379)
at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:602)
at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1084)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to
at org.openide.util.RequestProcessor.post(RequestProcessor.java:292)
at org.netbeans.modules.refactoring.spi.impl.ParametersPanel.refactor(ParametersPanel.java:369)
at org.netbeans.modules.refactoring.spi.impl.ParametersPanel.refactor(ParametersPanel.java:396)
at org.netbeans.modules.refactoring.spi.impl.ParametersPanel.access$200(ParametersPanel.java:84)
at org.netbeans.modules.refactoring.spi.impl.ParametersPanel$3.actionPerformed(ParametersPanel.java:239)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6134)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
at java.awt.Component.processEvent(Component.java:5899)
at java.awt.Container.processEvent(Container.java:2023)
at java.awt.Component.dispatchEventImpl(Component.java:4501)
at java.awt.Container.dispatchEventImpl(Container.java:2081)
at java.awt.Component.dispatchEvent(Component.java:4331)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4301)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3965)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3895)
at java.awt.Container.dispatchEventImpl(Container.java:2067)
at java.awt.Window.dispatchEventImpl(Window.java:2458)
at java.awt.Component.dispatchEvent(Component.java:4331)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:117)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:178)
at java.awt.Dialog$1.run(Dialog.java:1047)
at java.awt.Dialog$3.run(Dialog.java:1099)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Dialog.show(Dialog.java:1097)
at org.netbeans.core.windows.services.NbPresenter.superShow(NbPresenter.java:985)
at org.netbeans.core.windows.services.NbPresenter.doShow(NbPresenter.java:1019)
at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:1007)
at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:115)
at org.openide.util.Mutex.doEventAccess(Mutex.java:1355)
at org.openide.util.Mutex.readAccess(Mutex.java:268)
at org.netbeans.core.windows.services.NbPresenter.show(NbPresenter.java:992)
at java.awt.Component.show(Component.java:1447)
at java.awt.Component.setVisible(Component.java:1400)
at java.awt.Window.setVisible(Window.java:824)
at java.awt.Dialog.setVisible(Dialog.java:987)
at org.netbeans.modules.refactoring.spi.impl.ParametersPanel.showDialog(ParametersPanel.java:524)
at org.netbeans.modules.refactoring.spi.impl.RefactoringPanel.refresh(RefactoringPanel.java:571)
at org.netbeans.modules.refactoring.spi.impl.RefactoringPanel.<init>(RefactoringPanel.java:133)
at org.netbeans.modules.refactoring.spi.ui.UI.openRefactoringUI(UI.java:83)
at org.netbeans.modules.refactoring.java.ui.RefactoringActionsProvider$TreePathHandleTask.run(RefactoringActionsProvider.java:682)
at org.netbeans.modules.refactoring.java.RetoucheUtils.invokeAfterScanFinished(RetoucheUtils.java:952)
at org.netbeans.modules.refactoring.java.ui.JavaRefactoringActionsProvider.doExtractSuperclass(JavaRefactoringActionsProvider.java:185)
at org.netbeans.modules.refactoring.java.ui.JavaActionsImplementationFactory.doExtractSuperclass(JavaActionsImplementationFactory.java:113)
at org.netbeans.modules.refactoring.java.ui.ExtractSuperclassAction.performAction(ExtractSuperclassAction.java:58)
at org.netbeans.modules.refactoring.java.ui.JavaRefactoringGlobalAction.performAction(JavaRefactoringGlobalAction.java:135)
at org.openide.util.actions.NodeAction.performAction(NodeAction.java:296)
at org.openide.util.actions.CallableSystemAction$1.run(CallableSystemAction.java:127)
at org.netbeans.modules.openide.util.ActionsBridge.implPerformAction(ActionsBridge.java:83)
at org.netbeans.modules.openide.util.ActionsBridge.doPerformAction(ActionsBridge.java:64)
at org.openide.util.actions.CallableSystemAction.actionPerformed(CallableSystemAction.java:123)
at org.openide.util.actions.NodeAction.actionPerformed(NodeAction.java:284)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1225)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1266)
at java.awt.Component.processMouseEvent(Component.java:6134)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
at java.awt.Component.processEvent(Component.java:5899)
at java.awt.Container.processEvent(Container.java:2023)
at java.awt.Component.dispatchEventImpl(Component.java:4501)
at java.awt.Container.dispatchEventImpl(Container.java:2081)
at java.awt.Component.dispatchEvent(Component.java:4331)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4301)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3965)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3895)
at java.awt.Container.dispatchEventImpl(Container.java:2067)
at java.awt.Window.dispatchEventImpl(Window.java:2458)
at java.awt.Component.dispatchEvent(Component.java:4331)
[catch] at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:117)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)