Theme Generator Failed editing theme

• Create a Map using counties.shp
• Select "Change Style"
• Select "Theme", in the left panel select SQKM AND SEQUENTIAL.
• Select "Simple Feature"
  <<<< Udig presents an Error Dialog with the follwing reason:"Theme Generation Failed".

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Console:

java.lang.NullPointerException
at net.refractions.udig.style.sld.editor.StyleThemePage$5.run(StyleThemePage.java:1223)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at net.refractions.udig.style.sld.editor.StyleThemePage.generateTheme(StyleThemePage.java:1403)
at net.refractions.udig.style.sld.editor.StyleThemePage.gotFocus(StyleThemePage.java:1645)
at net.refractions.udig.style.sld.editor.StyleEditorPage$1.pageChanged(StyleEditorPage.java:93)
at net.refractions.udig.style.sld.editor.internal.EditorDialog$14.run(EditorDialog.java:1362)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
at net.refractions.udig.style.sld.editor.internal.EditorDialog.firePageChanged(EditorDialog.java:1360)
at net.refractions.udig.style.sld.editor.internal.EditorDialog.update(EditorDialog.java:1191)
at net.refractions.udig.style.sld.editor.internal.EditorDialog.showPage(EditorDialog.java:1145)
at net.refractions.udig.style.sld.editor.internal.FilteredEditorDialog.showPage(FilteredEditorDialog.java:350)
at net.refractions.udig.style.sld.editor.StyleEditorDialog.showPage(StyleEditorDialog.java:163)
at net.refractions.udig.style.sld.editor.internal.EditorDialog$8.selectionChanged(EditorDialog.java:656)
at org.eclipse.jface.viewers.StructuredViewer$3.run(StructuredViewer.java:867)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
at org.eclipse.jface.viewers.StructuredViewer.firePostSelectionChanged(StructuredViewer.java:865)
at org.eclipse.jface.viewers.StructuredViewer.handlePostSelect(StructuredViewer.java:1205)
at org.eclipse.jface.viewers.StructuredViewer$5.widgetSelected(StructuredViewer.java:1230)
at org.eclipse.jface.util.OpenStrategy.firePostSelectionEvent(OpenStrategy.java:251)
at org.eclipse.jface.util.OpenStrategy.access$5(OpenStrategy.java:245)
at org.eclipse.jface.util.OpenStrategy$3.run(OpenStrategy.java:419)
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:3527)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3174)
at org.eclipse.jface.window.Window.runEventLoop(Window.java:825)
at org.eclipse.jface.window.Window.open(Window.java:801)
at net.refractions.udig.style.sld.editor.OpenStyleEditorAction.run(OpenStyleEditorAction.java:79)
at org.eclipse.ui.internal.PluginAction.runWithEvent(PluginAction.java:251)
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.Display.runDeferredEvents(Display.java:3552)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3171)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2629)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2593)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2427)
at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:670)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:663)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at net.refractions.udig.internal.ui.UDIGApplication.start(UDIGApplication.java:136)
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)
at org.eclipse.equinox.launcher.Main.main(Main.java:1383)