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java.lang.NullPointerException: 	at org.eclipse.ui.internal.navigator.resources.workbench.TabbedPropertySheetTitleProvider.(TabbedPropertySheetTitleProvider.java:44)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)	at java.lang.reflect.Constructor.newInstance(Constructor.java:513)	at java.lang.Class.newInstance0(Class.java:355)	at java.lang.Class.newInstance(Class.java:308)	at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:184)	at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:904)	at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243)	at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:55)	at org.eclipse.ui.internal.views.properties.tabbed.view.TabbedPropertyRegistry.(TabbedPropertyRegistry.java:127)	at org.eclipse.ui.internal.views.properties.tabbed.view.TabbedPropertyRegistryFactory.createRegistry(TabbedPropertyRegistryFactory.java:74)	at org.eclipse.ui.views.properties.tabbed.TabbedPropertySheetPage.initContributor(TabbedPropertySheetPage.java:406)	at org.eclipse.ui.views.properties.tabbed.TabbedPropertySheetPage.(TabbedPropertySheetPage.java:295)	at org.eclipse.ui.views.properties.tabbed.TabbedPropertySheetPage.(TabbedPropertySheetPage.java:274)	at org.eclipse.ui.internal.navigator.resources.workbench.TabbedPropertySheetAdapterFactory.getAdapter(TabbedPropertySheetAdapterFactory.java:37)	at org.eclipse.core.internal.adapter.AdapterFactoryProxy.getAdapter(AdapterFactoryProxy.java:80)	at org.eclipse.core.internal.runtime.AdapterManager.getAdapter(AdapterManager.java:295)	at org.eclipse.ui.part.WorkbenchPart.getAdapter(WorkbenchPart.java:151)	at org.eclipse.ui.navigator.CommonNavigator.getAdapter(CommonNavigator.java:453)	at org.eclipse.ui.internal.views.ViewsPlugin.getAdapter(ViewsPlugin.java:103)	at org.eclipse.ui.views.properties.PropertySheet.doCreatePage(PropertySheet.java:206)	at org.eclipse.ui.part.PageBookView.createPage(PageBookView.java:408)	at org.eclipse.ui.part.PageBookView.partActivated(PageBookView.java:751)	at org.eclipse.ui.views.properties.PropertySheet.partActivated(PropertySheet.java:325)	at org.eclipse.ui.part.PageBookView.showBootstrapPart(PageBookView.java:920)	at org.eclipse.ui.part.PageBookView.createPartControl(PageBookView.java:491)	at org.eclipse.ui.views.properties.PropertySheet.createPartControl(PropertySheet.java:156)	at org.eclipse.ui.internal.ViewReference.createPartHelper(ViewReference.java:375)	at org.eclipse.ui.internal.ViewReference.createPart(ViewReference.java:229)	at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595)	at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:313)	at org.eclipse.ui.internal.ViewPane.setVisible(ViewPane.java:529)	at org.eclipse.ui.internal.presentations.PresentablePart.setVisible(PresentablePart.java:180)	at org.eclipse.ui.internal.presentations.util.PresentablePartFolder.select(PresentablePartFolder.java:270)	at org.eclipse.ui.internal.presentations.util.LeftToRightTabOrder.select(LeftToRightTabOrder.java:65)	at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.selectPart(TabbedStackPresentation.java:473)	at org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.java:1254)	at org.eclipse.ui.internal.PartStack.createControl(PartStack.java:666)	at org.eclipse.ui.internal.PartStack.createControl(PartStack.java:574)	at org.eclipse.ui.internal.PartSashContainer.createControl(PartSashContainer.java:568)	at org.eclipse.ui.internal.PerspectiveHelper.activate(PerspectiveHelper.java:272)	at org.eclipse.ui.internal.Perspective.onActivate(Perspective.java:981)	at org.eclipse.ui.internal.WorkbenchPage.setPerspective(WorkbenchPage.java:3614)	at org.eclipse.ui.internal.WorkbenchPage.busySetPerspective(WorkbenchPage.java:1041)	at org.eclipse.ui.internal.WorkbenchPage.access$16(WorkbenchPage.java:1025)	at org.eclipse.ui.internal.WorkbenchPage$19.run(WorkbenchPage.java:3715)	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)	at org.eclipse.ui.internal.WorkbenchPage.setPerspective(WorkbenchPage.java:3713)	at org.eclipse.ui.handlers.ShowPerspectiveHandler.openPerspective(ShowPerspectiveHandler.java:146)	at org.eclipse.ui.handlers.ShowPerspectiveHandler.execute(ShowPerspectiveHandler.java:61)	at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:293)	at org.eclipse.core.commands.Command.executeWithChecks(Command.java:476)	at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:508)	at org.eclipse.ui.internal.handlers.HandlerService.executeCommand(HandlerService.java:169)	at org.eclipse.ui.internal.handlers.SlaveHandlerService.executeCommand(SlaveHandlerService.java:241)	at org.eclipse.ui.internal.ChangeToPerspectiveMenu.run(ChangeToPerspectiveMenu.java:96)	at org.eclipse.ui.actions.PerspectiveMenu.run(PerspectiveMenu.java:363)	at org.eclipse.ui.actions.OpenPerspectiveAction.runWithEvent(OpenPerspectiveAction.java:78)	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:1053)	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4066)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3657)	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.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:619)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574)	at org.eclipse.equinox.launcher.Main.run(Main.java:1407)