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java.lang.NullPointerException: 	at org.yakindu.sct.ui.editor.policies.EnlargeContainerEditPolicy.getCommand(EnlargeContainerEditPolicy.java:71)	at org.eclipse.gef.editparts.AbstractEditPart.getCommand(AbstractEditPart.java:500)	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.gmf.runtime.diagram.ui.providers.internal.DefaultProvider.createSubCommands(DefaultProvider.java:1149)	at org.eclipse.gmf.runtime.diagram.ui.providers.internal.DefaultProvider.createNodeChangeBoundCommands(DefaultProvider.java:1117)	at org.eclipse.gmf.runtime.diagram.ui.providers.TopDownProvider.createNodeChangeBoundCommands(TopDownProvider.java:56)	at org.eclipse.gmf.runtime.diagram.ui.providers.internal.DefaultProvider.update_diagram(DefaultProvider.java:1051)	at org.eclipse.gmf.runtime.diagram.ui.providers.internal.DefaultProvider.layoutEditParts(DefaultProvider.java:150)	at org.eclipse.gmf.runtime.diagram.ui.services.layout.AbstractLayoutEditPartProvider.layoutLayoutNodes(AbstractLayoutEditPartProvider.java:69)	at org.eclipse.gmf.runtime.diagram.ui.internal.services.layout.LayoutNodesOperation.execute(LayoutNodesOperation.java:74)	at org.eclipse.gmf.runtime.common.core.service.ExecutionStrategy$1.execute(ExecutionStrategy.java:70)	at org.eclipse.gmf.runtime.common.core.service.Service.execute(Service.java:651)	at org.eclipse.gmf.runtime.diagram.ui.services.layout.LayoutService.execute(LayoutService.java:66)	at org.eclipse.gmf.runtime.diagram.ui.services.layout.LayoutService.layoutLayoutNodes(LayoutService.java:299)	at org.eclipse.gmf.runtime.diagram.ui.commands.ArrangeCommand.getCommandForExecution(ArrangeCommand.java:124)	at org.eclipse.gmf.runtime.diagram.ui.commands.ArrangeCommand.doExecuteWithResult(ArrangeCommand.java:93)	at org.eclipse.gmf.runtime.emf.commands.core.command.AbstractTransactionalCommand.doExecute(AbstractTransactionalCommand.java:247)	at org.eclipse.emf.workspace.AbstractEMFOperation.execute(AbstractEMFOperation.java:150)	at org.eclipse.emf.workspace.CompositeEMFOperation.doExecute(CompositeEMFOperation.java:217)	at org.eclipse.emf.workspace.AbstractEMFOperation.execute(AbstractEMFOperation.java:150)	at org.eclipse.core.commands.operations.DefaultOperationHistory.execute(DefaultOperationHistory.java:516)	at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramCommandStack.execute(DiagramCommandStack.java:194)	at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramCommandStack.execute(DiagramCommandStack.java:169)	at org.eclipse.gmf.runtime.diagram.ui.actions.DiagramAction.execute(DiagramAction.java:141)	at org.eclipse.gmf.runtime.diagram.ui.actions.DiagramAction.doRun(DiagramAction.java:103)	at org.eclipse.gmf.runtime.diagram.ui.actions.internal.ArrangeAction.doRun(ArrangeAction.java:278)	at org.eclipse.gmf.runtime.common.ui.action.AbstractActionHandler.run(AbstractActionHandler.java:359)	at org.eclipse.gmf.runtime.common.ui.action.ActionManager$1.run(ActionManager.java:225)	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)	at org.eclipse.gmf.runtime.common.ui.action.ActionManager.run(ActionManager.java:223)	at org.eclipse.gmf.runtime.common.ui.action.AbstractActionHandler.runWithEvent(AbstractActionHandler.java:377)	at org.eclipse.ui.actions.RetargetAction.runWithEvent(RetargetAction.java:239)	at org.eclipse.gmf.runtime.common.ui.action.ActionMenuManager$MenuCreatorAction.runWithEvent(ActionMenuManager.java:216)	at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:595)	at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:511)	at org.eclipse.jface.action.ActionContributionItem$6.handleEvent(ActionContributionItem.java:462)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4362)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1113)	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4180)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3769)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1127)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1018)	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:156)	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:694)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:606)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:139)	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:669)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:608)	at org.eclipse.equinox.launcher.Main.run(Main.java:1515)	at org.eclipse.equinox.launcher.Main.main(Main.java:1488)