java.lang.NullPointerException at org.netbeans.modules.erd.io.DocumentLoad.getChildNode(DocumentLoad.java:179) at org.netbeans.modules.erd.io.DocumentLoad.load(DocumentLoad.java:84) at org.netbeans.modules.erd.model.DocumentSerializer$1.run(DocumentSerializer.java:78) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1424) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1968) Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NullPointerException at org.openide.util.RequestProcessor.post(RequestProcessor.java:425) at org.netbeans.modules.erd.model.DocumentSerializer.startLoadingDocument(DocumentSerializer.java:112) at org.netbeans.modules.erd.editor.ERDTopComponent.componentOpened(ERDTopComponent.java:123) at org.openide.windows.WindowManager.componentOpenNotify(WindowManager.java:307) at org.netbeans.core.windows.WindowManagerImpl.notifyTopComponentOpened(WindowManagerImpl.java:1093) at org.netbeans.core.windows.Central.addModeOpenedTopComponent(Central.java:776) at org.netbeans.core.windows.ModeImpl.addOpenedTopComponent(ModeImpl.java:347) at org.netbeans.core.windows.WindowManagerImpl.topComponentOpenAtTabPosition(WindowManagerImpl.java:1205) at org.netbeans.core.windows.WindowManagerImpl.topComponentOpen(WindowManagerImpl.java:1170) at org.openide.windows.TopComponent.open(TopComponent.java:503) at org.openide.windows.TopComponent.open(TopComponent.java:483) at org.openide.windows.CloneableOpenSupport.openCloneableTopComponent(CloneableOpenSupport.java:202) at org.openide.windows.CloneableOpenSupport$1.run(CloneableOpenSupport.java:101) at org.openide.util.Mutex.doEvent(Mutex.java:1341) at org.openide.util.Mutex.writeAccess(Mutex.java:455) at org.openide.windows.CloneableOpenSupport.open(CloneableOpenSupport.java:98) at org.netbeans.modules.erd.editor.ERDEditorSupport.open(ERDEditorSupport.java:136) at org.netbeans.modules.erd.actions.ViewDiagramOnConnection.openDiagram(ViewDiagramOnConnection.java:105) at org.netbeans.modules.erd.actions.ViewDiagramOnConnection.actionPerformed(ViewDiagramOnConnection.java:77) at org.openide.awt.InjectorExactlyOne.actionPerformed(InjectorExactlyOne.java:78) at org.openide.awt.ContextAction$Performer.actionPerformed(ContextAction.java:226) at org.openide.awt.ContextManager.actionPerformed(ContextManager.java:250) at org.openide.awt.ContextAction.actionPerformed(ContextAction.java:109) at org.openide.util.actions.ActionInvoker$1.run(ActionInvoker.java:93) at org.openide.util.actions.ActionInvoker.doPerformAction(ActionInvoker.java:116) at org.openide.util.actions.ActionInvoker.invokeAction(ActionInvoker.java:99) at org.openide.awt.GeneralAction$DelegateAction.actionPerformed(GeneralAction.java:219) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242) at javax.swing.AbstractButton.doClick(AbstractButton.java:357) at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1223) at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1264) at java.awt.Component.processMouseEvent(Component.java:6267) at javax.swing.JComponent.processMouseEvent(JComponent.java:3267) at java.awt.Component.processEvent(Component.java:6032) 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:4577) 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:2478) at java.awt.Component.dispatchEvent(Component.java:4460) at java.awt.EventQueue.dispatchEvent(EventQueue.java:599) at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:148) 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)