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java.lang.NullPointerException: 	at org.eclipse.ltk.internal.ui.refactoring.ErrorWizardPage.performFinish(ErrorWizardPage.java:160)	at org.eclipse.ltk.ui.refactoring.RefactoringWizard.performFinish(RefactoringWizard.java:655)	at org.eclipse.ltk.internal.ui.refactoring.RefactoringWizardDialog2.okPressed(RefactoringWizardDialog2.java:500)	at org.eclipse.jface.dialogs.Dialog.buttonPressed(Dialog.java:472)	at org.eclipse.jface.dialogs.Dialog$2.widgetSelected(Dialog.java:624)	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:234)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1258)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1282)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1267)	at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1061)	at org.eclipse.swtbot.swt.finder.widgets.AbstractSWTBot$2.run(AbstractSWTBot.java:159)	at org.eclipse.swtbot.swt.finder.finders.UIThreadRunnable$5.doRun(UIThreadRunnable.java:221)	at org.eclipse.swtbot.swt.finder.finders.UIThreadRunnable$1.run(UIThreadRunnable.java:89)	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3515)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3164)	at org.eclipse.jface.window.Window.runEventLoop(Window.java:825)	at org.eclipse.jface.window.Window.open(Window.java:801)	at org.eclipse.ltk.ui.refactoring.RefactoringWizardOpenOperation$1.run(RefactoringWizardOpenOperation.java:186)	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)	at org.eclipse.ltk.ui.refactoring.RefactoringWizardOpenOperation.run(RefactoringWizardOpenOperation.java:199)	at org.eclipse.ltk.ui.refactoring.RefactoringWizardOpenOperation.run(RefactoringWizardOpenOperation.java:117)	at org.eclipse.jdt.internal.ui.refactoring.actions.RefactoringStarter.activate(RefactoringStarter.java:38)	at org.eclipse.jdt.internal.corext.refactoring.RefactoringExecutionStarter.startChangeSignatureRefactoring(RefactoringExecutionStarter.java:216)	at org.eclipse.jdt.ui.actions.ModifyParametersAction.run(ModifyParametersAction.java:156)	at org.eclipse.jdt.ui.actions.SelectionDispatchAction.dispatchRun(SelectionDispatchAction.java:278)	at org.eclipse.jdt.ui.actions.SelectionDispatchAction.run(SelectionDispatchAction.java:250)	at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)	at org.eclipse.ui.actions.RetargetAction.runWithEvent(RetargetAction.java:230)	at org.eclipse.ui.internal.WWinPluginAction.runWithEvent(WWinPluginAction.java:234)	at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:584)	at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:501)	at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:411)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1258)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1282)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1267)	at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1061)	at org.eclipse.swtbot.swt.finder.widgets.AbstractSWTBot$2.run(AbstractSWTBot.java:159)	at org.eclipse.swtbot.swt.finder.finders.UIThreadRunnable$5.doRun(UIThreadRunnable.java:221)	at org.eclipse.swtbot.swt.finder.finders.UIThreadRunnable$1.run(UIThreadRunnable.java:89)	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3515)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3164)	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2640)	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604)	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438)	at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)	at org.eclipse.swtbot.eclipse.core.UITestApplication.start(UITestApplication.java:54)	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:620)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:575)	at org.eclipse.equinox.launcher.Main.run(Main.java:1408)	at org.eclipse.equinox.launcher.Main.main(Main.java:1384)