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Caused by: java.lang.NullPointerException at org.eclipse.sketch.examples.shapes.diagram.edit.policies.ShapesBaseItemSemanticEditPolicy.addDestroyShortcutsCommand(ShapesBaseItemSemanticEditPolicy.java:303) at org.eclipse.sketch.examples.shapes.diagram.edit.policies.UnknownItemSemanticEditPolicy.getDestroyElementCommand(UnknownItemSemanticEditPolicy.java:95) at org.eclipse.sketch.examples.shapes.diagram.edit.policies.ShapesBaseItemSemanticEditPolicy.getSemanticCommandSwitch(ShapesBaseItemSemanticEditPolicy.java:184) at org.eclipse.sketch.examples.shapes.diagram.edit.policies.ShapesBaseItemSemanticEditPolicy.getSemanticCommand(ShapesBaseItemSemanticEditPolicy.java:114) at org.eclipse.gmf.runtime.diagram.ui.editpolicies.SemanticEditPolicy.getCommand(SemanticEditPolicy.java:69) at org.eclipse.sketch.examples.shapes.diagram.edit.policies.ShapesBaseItemSemanticEditPolicy.getCommand(ShapesBaseItemSemanticEditPolicy.java:97) at org.eclipse.gef.editparts.AbstractEditPart.getCommand(AbstractEditPart.java:501) at org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart.access$1(GraphicalEditPart.java:1) at org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart$1.run(GraphicalEditPart.java:482) at org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl.runExclusive(TransactionalEditingDomainImpl.java:328) at org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart.getCommand(GraphicalEditPart.java:477) at org.eclipse.sketch.examples.shapes.diagram.part.DeleteElementAction.getCommand(DeleteElementAction.java:91) at org.eclipse.gmf.runtime.diagram.ui.actions.DiagramAction.getCommand(DiagramAction.java:161) at org.eclipse.gmf.runtime.diagram.ui.actions.DiagramAction.calculateEnabled(DiagramAction.java:124) at org.eclipse.gmf.runtime.diagram.ui.actions.DiagramAction.refresh(DiagramAction.java:114) at org.eclipse.gmf.runtime.common.ui.action.AbstractActionHandler.selectionChanged(AbstractActionHandler.java:387) at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramGraphicalViewer.flushSelectionEvents(DiagramGraphicalViewer.java:269) at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramGraphicalViewer$1.run(DiagramGraphicalViewer.java:247) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134) ... 23 more