java.lang.NullPointerException
        at org.netbeans.modules.uml.diagrams.edges.sqd.MessageLabelManager.getDefaultAlignment(MessageLabelManager.java:253)
        at org.netbeans.modules.uml.drawingarea.AbstractLabelManager.showLabel(AbstractLabelManager.java:200)
        at org.netbeans.modules.uml.diagrams.edges.sqd.MessageLabelManager.showLabel(MessageLabelManager.java:286)
        at org.netbeans.modules.uml.drawingarea.AbstractLabelManager.showLabel(AbstractLabelManager.java:228)
        at org.netbeans.modules.uml.diagrams.edges.sqd.MessageWidget.load(MessageWidget.java:309)
        at org.netbeans.modules.uml.diagrams.edges.sqd.SynchronousMessageConnectionWidget.load(SynchronousMessageConnectionWidget.java:75)
        at org.netbeans.modules.uml.drawingarea.persistence.DiagramLoader.createSQDMessages(DiagramLoader.java:1301)
        at org.netbeans.modules.uml.drawingarea.persistence.DiagramLoader.access$000(DiagramLoader.java:101)
        at org.netbeans.modules.uml.drawingarea.persistence.DiagramLoader$1.perfomeAction(DiagramLoader.java:518)
        at org.netbeans.modules.uml.drawingarea.actions.AfterValidationExecutor.sceneValidated(AfterValidationExecutor.java:94)
        at org.netbeans.api.visual.widget.Scene.validate(Scene.java:420)
        at org.netbeans.modules.uml.diagrams.actions.sqd.AddCarFprPresentationElementAction.perfomeAction(AddCarFprPresentationElementAction.java:76)
        at org.netbeans.modules.uml.drawingarea.actions.AfterValidationExecutor.sceneValidated(AfterValidationExecutor.java:94)
        at org.netbeans.api.visual.widget.Scene.validate(Scene.java:420)
        at org.netbeans.modules.uml.diagrams.actions.sqd.AddCarFprPresentationElementAction.perfomeAction(AddCarFprPresentationElementAction.java:76)
        at org.netbeans.modules.uml.drawingarea.actions.AfterValidationExecutor.sceneValidated(AfterValidationExecutor.java:94)
        at org.netbeans.api.visual.widget.Scene.validate(Scene.java:420)
        at org.netbeans.modules.uml.diagrams.actions.sqd.AddCarFprPresentationElementAction.perfomeAction(AddCarFprPresentationElementAction.java:76)
        at org.netbeans.modules.uml.drawingarea.actions.AfterValidationExecutor.sceneValidated(AfterValidationExecutor.java:94)
        at org.netbeans.api.visual.widget.Scene.validate(Scene.java:420)
        at org.netbeans.modules.uml.diagrams.actions.sqd.AddCarFprPresentationElementAction.perfomeAction(AddCarFprPresentationElementAction.java:76)
        at org.netbeans.modules.uml.drawingarea.actions.AfterValidationExecutor.sceneValidated(AfterValidationExecutor.java:94)
        at org.netbeans.api.visual.widget.Scene.validate(Scene.java:420)
        at org.netbeans.api.visual.widget.SceneComponent.addNotify(SceneComponent.java:92)
        at java.awt.Container.addNotify(Container.java:2578)
        at javax.swing.JComponent.addNotify(JComponent.java:4685)
        at java.awt.Container.addNotify(Container.java:2578)
        at javax.swing.JComponent.addNotify(JComponent.java:4685)
        at java.awt.Container.addNotify(Container.java:2578)
        at javax.swing.JComponent.addNotify(JComponent.java:4685)
        at java.awt.Container.addNotify(Container.java:2578)
        at javax.swing.JComponent.addNotify(JComponent.java:4685)
        at java.awt.Container.addNotify(Container.java:2578)
        at javax.swing.JComponent.addNotify(JComponent.java:4685)
        at java.awt.Container.addImpl(Container.java:1068)
        at java.awt.Container.add(Container.java:365)
        at org.netbeans.swing.tabcontrol.plaf.StackLayout.showComponent(StackLayout.java:75)
        at org.netbeans.swing.tabcontrol.plaf.DefaultTabbedContainerUI.showComponent(DefaultTabbedContainerUI.java:572)
        at org.netbeans.swing.tabcontrol.plaf.DefaultTabbedContainerUI$NoOpFxProvider.doFinish(DefaultTabbedContainerUI.java:1366)
        at org.netbeans.swing.tabcontrol.plaf.FxProvider.finish(FxProvider.java:102)
        at org.netbeans.swing.tabcontrol.plaf.DefaultTabbedContainerUI$NoOpFxProvider.doStart(DefaultTabbedContainerUI.java:1371)
        at org.netbeans.swing.tabcontrol.plaf.FxProvider.start(FxProvider.java:85)
        at org.netbeans.swing.tabcontrol.plaf.DefaultTabbedContainerUI.showComponentWithFxProvider(DefaultTabbedContainerUI.java:601)
        at org.netbeans.swing.tabcontrol.plaf.DefaultTabbedContainerUI$SelectionListener.stateChanged(DefaultTabbedContainerUI.java:1068)
        at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:123)
        at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:109)
        at org.netbeans.swing.tabcontrol.plaf.DefaultTabSelectionModel.indicesChanged(DefaultTabSelectionModel.java:273)
        at org.netbeans.swing.tabcontrol.DefaultTabDataModel.fireIndicesChanged(DefaultTabDataModel.java:492)
        at org.netbeans.swing.tabcontrol.DefaultTabDataModel.setTabs(DefaultTabDataModel.java:120)
        at org.netbeans.core.windows.view.ui.tabcontrol.TabbedAdapter.setTopComponents(TabbedAdapter.java:234)
        at org.netbeans.core.windows.view.ui.TabbedHandler.setTopComponents(TabbedHandler.java:153)
        at org.netbeans.core.windows.view.ui.AbstractModeContainer.setTopComponents(AbstractModeContainer.java:124)
        at org.netbeans.core.windows.view.ModeView.setTopComponents(ModeView.java:137)
        at org.netbeans.core.windows.view.ViewHierarchy.updateViewForAccessor(ViewHierarchy.java:254)
        at org.netbeans.core.windows.view.ViewHierarchy.updateViewForAccessor(ViewHierarchy.java:241)
        at org.netbeans.core.windows.view.ViewHierarchy.updateViewForAccessor(ViewHierarchy.java:226)
        at org.netbeans.core.windows.view.ViewHierarchy.updateViewHierarchy(ViewHierarchy.java:143)
        at org.netbeans.core.windows.view.DefaultView.changeGUI(DefaultView.java:149)
        at org.netbeans.core.windows.ViewRequestor.dispatchRequest(ViewRequestor.java:269)
        at org.netbeans.core.windows.ViewRequestor.processRequest(ViewRequestor.java:245)
        at org.netbeans.core.windows.ViewRequestor.postRequest(ViewRequestor.java:183)
        at org.netbeans.core.windows.ViewRequestor.scheduleRequest(ViewRequestor.java:123)
        at org.netbeans.core.windows.Central.addModeOpenedTopComponent(Central.java:757)
        at org.netbeans.core.windows.ModeImpl.addOpenedTopComponent(ModeImpl.java:311)
        at org.netbeans.core.windows.WindowManagerImpl.topComponentOpenAtTabPosition(WindowManagerImpl.java:1115)
        at org.netbeans.core.windows.WindowManagerImpl.topComponentOpen(WindowManagerImpl.java:1082)
        at org.openide.windows.TopComponent.open(TopComponent.java:434)
        at org.openide.windows.TopComponent.open(TopComponent.java:425)
        at org.netbeans.modules.uml.drawingarea.UMLDiagramManager$ShowTopComponentGroup.show(UMLDiagramManager.java:978)
        at org.netbeans.modules.uml.drawingarea.UMLDiagramManager$ShowTopComponentGroup.run(UMLDiagramManager.java:973)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:199)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)