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java.lang.IllegalArgumentException: Argument cannot be null	at org.eclipse.swt.SWT.error(SWT.java:4263)	at org.eclipse.swt.SWT.error(SWT.java:4197)	at org.eclipse.swt.SWT.error(SWT.java:4168)	at org.eclipse.swt.widgets.Widget.error(Widget.java:466)	at org.eclipse.swt.widgets.Text.setText(Text.java:2099)	at org.springframework.ide.eclipse.webflow.ui.graph.dialogs.SetActionPropertiesDialog.createDialogArea(SetActionPropertiesDialog.java:232)	at org.eclipse.jface.dialogs.TitleAreaDialog.createContents(TitleAreaDialog.java:155)	at org.springframework.ide.eclipse.webflow.ui.graph.dialogs.SetActionPropertiesDialog.createContents(SetActionPropertiesDialog.java:125)	at org.eclipse.jface.window.Window.create(Window.java:431)	at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1089)	at org.eclipse.jface.window.Window.open(Window.java:790)	at org.springframework.ide.eclipse.webflow.ui.graph.dialogs.DialogUtils$1.run(DialogUtils.java:150)	at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:180)	at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:150)	at org.eclipse.swt.widgets.Display.syncExec(Display.java:4330)	at org.springframework.ide.eclipse.webflow.ui.graph.dialogs.DialogUtils.openPropertiesDialog(DialogUtils.java:81)	at org.springframework.ide.eclipse.webflow.ui.graph.dialogs.DialogUtils.openPropertiesDialog(DialogUtils.java:66)	at org.springframework.ide.eclipse.webflow.ui.graph.dialogs.ActionComposite$7.widgetSelected(ActionComposite.java:292)	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:240)	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.Display.runDeferredEvents(Display.java:3588)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3209)	at org.eclipse.jface.window.Window.runEventLoop(Window.java:825)	at org.eclipse.jface.window.Window.open(Window.java:801)	at org.springframework.ide.eclipse.webflow.ui.graph.dialogs.DialogUtils$1.run(DialogUtils.java:150)	at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:180)	at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:150)	at org.eclipse.swt.widgets.Display.syncExec(Display.java:4330)	at org.springframework.ide.eclipse.webflow.ui.graph.dialogs.DialogUtils.openPropertiesDialog(DialogUtils.java:81)	at org.springframework.ide.eclipse.webflow.ui.graph.dialogs.DialogUtils.openPropertiesDialog(DialogUtils.java:66)	at org.springframework.ide.eclipse.webflow.ui.graph.actions.EditPropertiesAction.runWithCommand(EditPropertiesAction.java:124)	at org.springframework.ide.eclipse.webflow.ui.graph.actions.EditPropertiesAction.run(EditPropertiesAction.java:108)	at org.springframework.ide.eclipse.webflow.ui.graph.parts.ChildrenStatePart.performRequest(ChildrenStatePart.java:243)	at org.eclipse.gef.tools.SelectEditPartTracker.performOpen(SelectEditPartTracker.java:194)	at org.eclipse.gef.tools.SelectEditPartTracker.handleDoubleClick(SelectEditPartTracker.java:137)	at org.eclipse.gef.tools.AbstractTool.mouseDoubleClick(AbstractTool.java:1069)	at org.eclipse.gef.tools.SelectionTool.mouseDoubleClick(SelectionTool.java:527)	at org.eclipse.gef.EditDomain.mouseDoubleClick(EditDomain.java:231)	at org.eclipse.gef.ui.parts.DomainEventDispatcher.dispatchMouseDoubleClicked(DomainEventDispatcher.java:291)	at org.eclipse.draw2d.LightweightSystem$EventHandler.mouseDoubleClick(LightweightSystem.java:518)	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:195)	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.Display.runDeferredEvents(Display.java:3588)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3209)	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2701)	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2665)	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2499)	at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:679)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:668)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123)	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:344)	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:622)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)	at org.eclipse.equinox.launcher.Main.run(Main.java:1410)	at org.eclipse.equinox.launcher.Main.main(Main.java:1386)