java.lang.NullPointerException
        at org.netbeans.modules.uml.ui.support.diagramsupport.ProxyDiagramManager.getDiagramLocationsInProject(ProxyDiagramManager.java:1242)
        at org.netbeans.modules.uml.ui.support.diagramsupport.ProxyDiagramManager.getDiagramsInProject(ProxyDiagramManager.java:770)
        at org.netbeans.modules.uml.ui.support.diagramsupport.ProxyDiagramManager.getDiagramsInProject(ProxyDiagramManager.java:747)
        at org.netbeans.modules.uml.ui.controls.newdialog.NewDialogUtilities.getNextDiagramCounter(NewDialogUtilities.java:697)
        at org.netbeans.modules.uml.ui.controls.newdialog.NewDialogUtilities.getDefaultDiagramName(NewDialogUtilities.java:678)
        at org.netbeans.modules.uml.ui.controls.newdialog.NewUMLDiagVisualPanel1.updateDefaultDiagramName(NewUMLDiagVisualPanel1.java:125)
        at org.netbeans.modules.uml.ui.controls.newdialog.NewUMLDiagVisualPanel1.valueChanged(NewUMLDiagVisualPanel1.java:499)
        at javax.swing.JList.fireSelectionValueChanged(JList.java:1765)
        at javax.swing.JList$ListSelectionHandler.valueChanged(JList.java:1779)
        at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:167)
        at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:147)
        at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:194)
        at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:388)
        at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:398)
        at javax.swing.DefaultListSelectionModel.setSelectionInterval(DefaultListSelectionModel.java:442)
        at javax.swing.JList.setSelectedIndex(JList.java:2179)
        at org.netbeans.modules.uml.ui.controls.newdialog.NewUMLDiagVisualPanel1.populateList(NewUMLDiagVisualPanel1.java:457)
        at org.netbeans.modules.uml.ui.controls.newdialog.NewUMLDiagVisualPanel1.read(NewUMLDiagVisualPanel1.java:146)
        at org.netbeans.modules.uml.ui.controls.newdialog.NewUMLDiagWizardPanel1.readSettings(NewUMLDiagWizardPanel1.java:134)
        at org.openide.WizardDescriptor.updateStateOpen(WizardDescriptor.java:826)
        at org.openide.WizardDescriptor.updateState(WizardDescriptor.java:801)
        at org.openide.WizardDescriptor.initialize(WizardDescriptor.java:490)
        at org.openide.NotifyDescriptor.getterCalled(NotifyDescriptor.java:260)
        at org.openide.DialogDescriptor.isModal(DialogDescriptor.java:319)
        at org.netbeans.core.windows.services.NbDialog.<init>(NbDialog.java:64)
        at org.netbeans.core.windows.services.DialogDisplayerImpl$1.run(DialogDisplayerImpl.java:131)
        at org.netbeans.core.windows.services.DialogDisplayerImpl$1.run(DialogDisplayerImpl.java:107)
        at org.openide.util.Mutex.doEventAccess(Mutex.java:1355)
        at org.openide.util.Mutex.readAccess(Mutex.java:268)
        at org.netbeans.core.windows.services.DialogDisplayerImpl.createDialog(DialogDisplayerImpl.java:106)
        at org.netbeans.modules.uml.drawingarea.UMLDiagramManager.doNewDiagramDialog(UMLDiagramManager.java:704)
        at org.netbeans.modules.uml.drawingarea.UMLDiagramManager.newDiagramDialog(UMLDiagramManager.java:210)
        at org.netbeans.modules.uml.drawingarea.ui.addins.diagramcreator.DiagCreatorAddIn.guiCreateDiagram(DiagCreatorAddIn.java:819)
        at org.netbeans.modules.uml.drawingarea.ui.addins.diagramcreator.DiagCreatorAddIn.guiCreateDiagramFromElements(DiagCreatorAddIn.java:244)
        at org.netbeans.modules.uml.drawingarea.actions.CreateDiagramFromSelectedElementsAction.performAction(CreateDiagramFromSelectedElementsAction.java:87)
        at org.openide.util.actions.NodeAction$DelegateAction$1.run(NodeAction.java:581)
        at org.netbeans.modules.openide.util.ActionsBridge.doPerformAction(ActionsBridge.java:77)
        at org.openide.util.actions.NodeAction$DelegateAction.actionPerformed(NodeAction.java:577)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
        at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
        at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1225)
        at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1266)
        at java.awt.Component.processMouseEvent(Component.java:6134)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
        at java.awt.Component.processEvent(Component.java:5899)
        at java.awt.Container.processEvent(Container.java:2023)
        at java.awt.Component.dispatchEventImpl(Component.java:4501)
        at java.awt.Container.dispatchEventImpl(Container.java:2081)
        at java.awt.Component.dispatchEvent(Component.java:4331)
        at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4301)
        at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:3965)
        at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:3895)
        at java.awt.Container.dispatchEventImpl(Container.java:2067)
        at java.awt.Window.dispatchEventImpl(Window.java:2458)
        at java.awt.Component.dispatchEvent(Component.java:4331)
        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)