ava.lang.NullPointerException
	at org.netbeans.api.visual.widget.Widget.addChild(Widget.java:235)
	at org.netbeans.api.visual.widget.Widget.addChild(Widget.java:226)
	at org.netbeans.modules.uml.drawingarea.view.DesignerScene.attachEdgeWidget(DesignerScene.java:311)
	at org.netbeans.modules.uml.drawingarea.view.DesignerScene.attachEdgeWidget(DesignerScene.java:90)
	at org.netbeans.api.visual.graph.GraphScene.addEdge(GraphScene.java:152)
	at org.netbeans.modules.uml.diagrams.edges.NestedLinkConnectProvider.createConnection(NestedLinkConnectProvider.java:148)
	at org.netbeans.modules.uml.drawingarea.actions.ConnectAction.mouseReleased(ConnectAction.java:107)
	at org.netbeans.api.visual.widget.SceneComponent$Operator$3.operate(SceneComponent.java:553)
	at org.netbeans.api.visual.widget.SceneComponent.processLocationOperator(SceneComponent.java:268)
	at org.netbeans.api.visual.widget.SceneComponent.mouseReleased(SceneComponent.java:155)
	at java.awt.Component.processMouseEvent(Component.java:5602)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3135)
	at java.awt.Component.processEvent(Component.java:5367)
	at java.awt.Container.processEvent(Container.java:2010)
	at java.awt.Component.dispatchEventImpl(Component.java:4068)
	at java.awt.Container.dispatchEventImpl(Container.java:2068)
	at java.awt.Component.dispatchEvent(Component.java:3903)
	at org.netbeans.modules.uml.drawingarea.palette.context.PaletteButton$ButtonListener.mouseReleased(PaletteButton.java:316)
	at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:232)
	at java.awt.Component.processMouseEvent(Component.java:5602)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3135)
	at java.awt.Component.processEvent(Component.java:5367)
	at java.awt.Container.processEvent(Container.java:2010)
	at java.awt.Component.dispatchEventImpl(Component.java:4068)
	at java.awt.Container.dispatchEventImpl(Container.java:2068)
	at java.awt.Component.dispatchEvent(Component.java:3903)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4256)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3936)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3866)
	at java.awt.Container.dispatchEventImpl(Container.java:2054)
	at java.awt.Window.dispatchEventImpl(Window.java:1791)
	at java.awt.Component.dispatchEvent(Component.java:3903)
[catch] at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
	at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)