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org.eclipse.core.runtime.AssertionFailedException: null argument:	at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:85)	at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:73)	at org.eclipse.gef.editparts.AbstractEditPart.addChild(AbstractEditPart.java:202)	at org.eclipse.gef.editparts.AbstractEditPart.refreshChildren(AbstractEditPart.java:773)	at org.eclipse.gef.editparts.AbstractEditPart.refresh(AbstractEditPart.java:718)	at org.eclipse.gef.editparts.AbstractGraphicalEditPart.refresh(AbstractGraphicalEditPart.java:633)	at com.springsource.sts.config.flow.parts.ActivityDiagramPart.refresh(ActivityDiagramPart.java:211)	at org.eclipse.gef.editparts.AbstractEditPart.addNotify(AbstractEditPart.java:252)	at org.eclipse.gef.editparts.AbstractGraphicalEditPart.addNotify(AbstractGraphicalEditPart.java:223)	at org.eclipse.gef.editparts.AbstractEditPart.addChild(AbstractEditPart.java:211)	at org.eclipse.gef.editparts.SimpleRootEditPart.setContents(SimpleRootEditPart.java:105)	at org.eclipse.gef.ui.parts.AbstractEditPartViewer.setContents(AbstractEditPartViewer.java:617)	at org.eclipse.gef.ui.parts.AbstractEditPartViewer.setContents(AbstractEditPartViewer.java:626)	at com.springsource.sts.config.flow.AbstractConfigGraphicalEditor.initializeGraphicalViewer(AbstractConfigGraphicalEditor.java:371)	at org.eclipse.gef.ui.parts.GraphicalEditor.createGraphicalViewer(GraphicalEditor.java:158)	at org.eclipse.gef.ui.parts.GraphicalEditorWithPalette.createPartControl(GraphicalEditorWithPalette.java:63)	at org.eclipse.ui.part.MultiPageEditorPart.addPage(MultiPageEditorPart.java:241)	at org.eclipse.ui.forms.editor.FormEditor.addPage(FormEditor.java:325)	at com.springsource.sts.config.ui.editors.AbstractConfigEditor.addConfigEditorPage(AbstractConfigEditor.java:215)	at com.springsource.sts.config.ui.editors.AbstractConfigEditor.updateNamespacePages(AbstractConfigEditor.java:932)	at com.springsource.sts.config.ui.editors.SpringConfigEditor.updateNamespacePages(SpringConfigEditor.java:182)	at com.springsource.sts.config.ui.editors.AbstractConfigEditor.createNamespacePages(AbstractConfigEditor.java:275)	at com.springsource.sts.config.ui.editors.AbstractConfigEditor.addPages(AbstractConfigEditor.java:245)	at org.eclipse.ui.forms.editor.FormEditor.createPages(FormEditor.java:138)