java.lang.NullPointerException
        at org.netbeans.modules.uml.diagrams.edges.factories.MessageFactory.getMessageNextToPoint(MessageFactory.java:128)
        at org.netbeans.modules.uml.diagrams.actions.sqd.MessagesConnectProvider.handleCreateConnection(MessagesConnectProvider.java:444)
        at org.netbeans.modules.uml.diagrams.actions.sqd.MessagesConnectProvider.createConnection(MessagesConnectProvider.java:353)
        at org.netbeans.modules.uml.diagrams.actions.sqd.ConnectAction.mouseReleased(ConnectAction.java:199)
        at org.netbeans.api.visual.widget.SceneComponent$Operator$3.operate(SceneComponent.java:561)
        at org.netbeans.api.visual.widget.SceneComponent.processLocationOperator(SceneComponent.java:276)
        at org.netbeans.api.visual.widget.SceneComponent.mouseReleased(SceneComponent.java:163)
        at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272)
        at java.awt.Component.processMouseEvent(Component.java:6263)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3255)
        at java.awt.Component.processEvent(Component.java:6028)
        at java.awt.Container.processEvent(Container.java:2041)
        at java.awt.Component.dispatchEventImpl(Component.java:4630)
        at java.awt.Container.dispatchEventImpl(Container.java:2099)
        at java.awt.Component.dispatchEvent(Component.java:4460)
        at org.netbeans.modules.uml.drawingarea.palette.context.PaletteButton$ButtonListener.mouseReleased(PaletteButton.java:343)
        at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:273)
        at java.awt.Component.processMouseEvent(Component.java:6263)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3255)
        at java.awt.Component.processEvent(Component.java:6028)
        at java.awt.Container.processEvent(Container.java:2041)
        at java.awt.Component.dispatchEventImpl(Component.java:4630)
        at java.awt.Container.dispatchEventImpl(Container.java:2099)
        at java.awt.Component.dispatchEvent(Component.java:4460)
        at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4574)
        at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4238)
        at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4168)
        at java.awt.Container.dispatchEventImpl(Container.java:2085)
        at java.awt.Window.dispatchEventImpl(Window.java:2475)
        at java.awt.Component.dispatchEvent(Component.java:4460)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
        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)