NPE Selecting Staging table extension tab and right-clicking to select Add To From action

Working the E2E XML Book Set Mixed Test Script....

1) Create Staging table at root and set SQL
2) Opened "Authors" T-Diagram
3) Selected the Staging Table's extension in diagram and right-clicked

Got the following

java.lang.NullPointerException
at com.metamatrix.modeler.mapping.ui.actions.MappingDiagramActionAdapter.getModelObjectActionContributors(MappingDiagramActionAdapter.java:1392)
at com.metamatrix.modeler.mapping.ui.actions.MappingDiagramActionAdapter.addExternalExportedActions(MappingDiagramActionAdapter.java:935)
at com.metamatrix.modeler.mapping.ui.actions.MappingDiagramActionAdapter.contributeDetailedActions(MappingDiagramActionAdapter.java:772)
at com.metamatrix.modeler.mapping.ui.actions.MappingDiagramActionAdapter.contributeToMenuManager(MappingDiagramActionAdapter.java:472)
at com.metamatrix.modeler.internal.diagram.ui.editor.DiagramActionContributor.menuAboutToShow(DiagramActionContributor.java:394)