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java.lang.NullPointerException: 	at com.codeaffine.extras.workingset.internal.DynamicWorkingSetPage.finish(DynamicWorkingSetPage.java:81)	at org.eclipse.ui.internal.dialogs.WorkingSetNewWizard.performFinish(WorkingSetNewWizard.java:138)	at org.eclipse.jface.wizard.WizardDialog.finishPressed(WizardDialog.java:790)	at org.eclipse.jface.wizard.WizardDialog.buttonPressed(WizardDialog.java:423)	at org.eclipse.jface.dialogs.Dialog$2.widgetSelected(Dialog.java:622)	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:249)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:86)	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4431)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1079)	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4241)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3820)	at org.eclipse.jface.window.Window.runEventLoop(Window.java:818)	at org.eclipse.jface.window.Window.open(Window.java:794)	at org.eclipse.ui.internal.dialogs.AbstractWorkingSetDialog.createWorkingSet(AbstractWorkingSetDialog.java:251)	at org.eclipse.ui.internal.dialogs.AbstractWorkingSetDialog$1.widgetSelected(AbstractWorkingSetDialog.java:123)	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:249)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:86)	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4431)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1079)	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4241)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3820)	at org.eclipse.jface.window.Window.runEventLoop(Window.java:818)	at org.eclipse.jface.window.Window.open(Window.java:794)	at org.eclipse.ui.internal.dialogs.AbstractWorkingSetDialog.open(AbstractWorkingSetDialog.java:314)	at org.eclipse.ui.internal.actions.SelectWorkingSetAction.run(SelectWorkingSetAction.java:72)	at org.eclipse.jface.action.Action.runWithEvent(Action.java:473)	at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:565)	at org.eclipse.jface.action.ActionContributionItem.lambda$4(ActionContributionItem.java:397)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:86)	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4431)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1079)	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4241)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3820)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1133)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1022)	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:153)	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:698)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:610)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148)	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:138)	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:388)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:653)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:590)	at org.eclipse.equinox.launcher.Main.run(Main.java:1499)