java.lang.NullPointerException at org.openide.util.lookup.ProxyLookup$R.lookupChange(ProxyLookup.java:461) at org.openide.util.lookup.ProxyLookup.setData(ProxyLookup.java:314) at org.openide.util.lookup.ProxyLookup.setLookups(ProxyLookup.java:153) at org.openide.util.lookup.ProxyLookup.setLookups(ProxyLookup.java:126) at org.netbeans.core.multiview.MultiViewTopComponentLookup$MyProxyLookup.setElementLookup(MultiViewTopComponentLookup.java:208) at org.netbeans.core.multiview.MultiViewTopComponentLookup.setElementLookup(MultiViewTopComponentLookup.java:71) at org.netbeans.core.multiview.MultiViewPeer.assignLookup(MultiViewPeer.java:241) at org.netbeans.core.multiview.MultiViewPeer.assignLookup(MultiViewPeer.java:253) at org.netbeans.core.multiview.MultiViewCloneableTopComponent.getLookup(MultiViewCloneableTopComponent.java:118) at org.netbeans.modules.localhistory.LocalHistory$OpenedFilesListener.getFiles(LocalHistory.java:538) at org.netbeans.modules.localhistory.LocalHistory$OpenedFilesListener.access$200(LocalHistory.java:454) at org.netbeans.modules.localhistory.LocalHistory$OpenedFilesListener$1.run(LocalHistory.java:465) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1432) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2042) Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NullPointerException at org.openide.util.RequestProcessor.post(RequestProcessor.java:424) at org.netbeans.modules.localhistory.LocalHistory$OpenedFilesListener.propertyChange(LocalHistory.java:458) at java.beans.PropertyChangeSupport.fire(PropertyChangeSupport.java:335) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:327) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:263) at org.netbeans.core.windows.RegistryImpl.doFirePropertyChange(RegistryImpl.java:329) at org.netbeans.core.windows.RegistryImpl.topComponentOpened(RegistryImpl.java:187) at org.netbeans.core.windows.WindowManagerImpl.notifyRegistryTopComponentOpened(WindowManagerImpl.java:1174) at org.netbeans.core.windows.WindowManagerImpl.notifyTopComponentOpened(WindowManagerImpl.java:1142) at org.netbeans.core.windows.Central.addModeOpenedTopComponent(Central.java:798) at org.netbeans.core.windows.ModeImpl.addOpenedTopComponent(ModeImpl.java:354) at org.netbeans.core.windows.WindowManagerImpl.topComponentOpenAtTabPosition(WindowManagerImpl.java:1252) at org.netbeans.core.windows.WindowManagerImpl.topComponentOpen(WindowManagerImpl.java:1217) at org.openide.windows.TopComponent.open(TopComponent.java:497) at org.openide.windows.TopComponent.open(TopComponent.java:477) at org.openide.windows.CloneableOpenSupport.openCloneableTopComponent(CloneableOpenSupport.java:202) at org.openide.windows.CloneableOpenSupport$1.run(CloneableOpenSupport.java:101) at org.openide.util.Mutex.doEvent(Mutex.java:1343) at org.openide.util.Mutex.writeAccess(Mutex.java:457) at org.openide.windows.CloneableOpenSupport.open(CloneableOpenSupport.java:98) at org.openide.text.CloneableEditorSupport.open(CloneableEditorSupport.java:510) at org.netbeans.modules.properties.PropertiesEditorSupport.open(PropertiesEditorSupport.java:420) at org.openide.windows.CloneableOpenSupport.edit(CloneableOpenSupport.java:121) at org.openide.awt.ActionDefaultPerfomer.actionPerformed(ActionDefaultPerfomer.java:76) at org.openide.awt.ContextAction$Performer.actionPerformed(ContextAction.java:226) at org.openide.awt.ContextManager.actionPerformed(ContextManager.java:257) at org.openide.awt.ContextAction.actionPerformed(ContextAction.java:109) at org.openide.util.actions.ActionInvoker$1.run(ActionInvoker.java:93) at org.openide.util.actions.ActionInvoker.doPerformAction(ActionInvoker.java:116) at org.openide.util.actions.ActionInvoker.invokeAction(ActionInvoker.java:99) at org.openide.awt.GeneralAction$BaseDelAction.actionPerformed(GeneralAction.java:234) at org.openide.loaders.TemplateWizard$DefaultIterator$1.run(TemplateWizard.java:924) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:727) at java.awt.EventQueue.access$200(EventQueue.java:103) at java.awt.EventQueue$3.run(EventQueue.java:688) at java.awt.EventQueue$3.run(EventQueue.java:686) at java.security.AccessController.doPrivileged(AccessController.java:0) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76) at java.awt.EventQueue.dispatchEvent(EventQueue.java:697) at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:154) at java.awt.WaitDispatchSupport$2.run(WaitDispatchSupport.java:182) at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:221) at java.security.AccessController.doPrivileged(AccessController.java:0) at java.awt.WaitDispatchSupport.enter(WaitDispatchSupport.java:219) at java.awt.Dialog.show(Dialog.java:1082) at org.netbeans.core.windows.services.NbPresenter.superShow(NbPresenter.java:1078) at org.netbeans.core.windows.services.NbPresenter.doShow(NbPresenter.java:1128) at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:1100) at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:128) at org.openide.util.Mutex.doEventAccess(Mutex.java:1363) at org.openide.util.Mutex.readAccess(Mutex.java:273) at org.netbeans.core.windows.services.NbPresenter.show(NbPresenter.java:1085) at java.awt.Component.show(Component.java:1651) at java.awt.Component.setVisible(Component.java:1603) at java.awt.Window.setVisible(Window.java:1014) at java.awt.Dialog.setVisible(Dialog.java:1005) at org.netbeans.core.windows.services.DialogDisplayerImpl$1AWTQuery.showDialog(DialogDisplayerImpl.java:260) at org.netbeans.core.windows.services.DialogDisplayerImpl$1AWTQuery.run(DialogDisplayerImpl.java:186) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:727) at java.awt.EventQueue.access$200(EventQueue.java:103) at java.awt.EventQueue$3.run(EventQueue.java:688) at java.awt.EventQueue$3.run(EventQueue.java:686) at java.security.AccessController.doPrivileged(AccessController.java:0) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76) at java.awt.EventQueue.dispatchEvent(EventQueue.java:697) at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138) at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)