java.lang.NullPointerException at org.openide.nodes.EntrySupport$Lazy.removeEntries(EntrySupport.java:1800) at org.openide.nodes.EntrySupport$Lazy.refreshEntry(EntrySupport.java:1334) at org.openide.nodes.Children$Keys$1.run(Children.java:1460) at org.openide.util.Mutex$1Exec.run(Mutex.java:1244) at org.openide.nodes.Children$ProjectManagerDeadlockDetector.execute(Children.java:1920) at org.openide.util.Mutex.postRequest(Mutex.java:1250) at org.openide.util.Mutex.postRequest(Mutex.java:1213) at org.openide.util.Mutex.postWriteRequest(Mutex.java:585) at org.openide.nodes.Children$Keys.refreshKey(Children.java:1457) at org.openide.loaders.FolderChildren.access$700(FolderChildren.java:73) at org.openide.loaders.FolderChildren$DelayedNode.run(FolderChildren.java:429) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1404) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1984) Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NullPointerException at org.openide.util.RequestProcessor.post(RequestProcessor.java:421) at org.openide.loaders.FolderChildren$DelayedNode.(FolderChildren.java:420) at org.openide.loaders.FolderChildren$DelayedNode.(FolderChildren.java:409) at org.openide.loaders.FolderChildren$DelayedNode.(FolderChildren.java:405) at org.openide.loaders.FolderChildren.createNodes(FolderChildren.java:220) at org.openide.loaders.FolderChildren.createNodes(FolderChildren.java:73) at org.openide.nodes.Children$Keys$KE.nodes(Children.java:1661) at org.openide.nodes.EntrySupport$Lazy$EntryInfo.getNode(EntrySupport.java:1645) at org.openide.nodes.EntrySupport$Lazy$EntryInfo.getNode(EntrySupport.java:1611) at org.openide.nodes.EntrySupport$Lazy$LazySnapshot.get(EntrySupport.java:1876) at org.openide.nodes.FilterNode$Children$LazySupport$FilterNodeEntry.nodes(FilterNode.java:1886) at org.openide.nodes.EntrySupport$Lazy$EntryInfo.getNode(EntrySupport.java:1645) at org.openide.nodes.FilterNode$Children$LazySupport$FilterLazySnapshot.get(FilterNode.java:1741) at org.openide.nodes.EntrySupport$Lazy$LazySnapshot.get(EntrySupport.java:1871) at org.openide.nodes.EntrySupport$Lazy$LazySnapshot.get(EntrySupport.java:1858) at org.openide.explorer.view.VisualizerChildren.getChildAt(VisualizerChildren.java:127) at org.openide.explorer.view.VisualizerNode.getChildAt(VisualizerNode.java:321) at javax.swing.tree.DefaultTreeModel.getChild(DefaultTreeModel.java:156) at javax.swing.tree.FixedHeightLayoutCache$VisibleFHTreeStateNodeEnumeration.nextElement(FixedHeightLayoutCache.java:1506) at javax.swing.tree.FixedHeightLayoutCache$VisibleFHTreeStateNodeEnumeration.nextElement(FixedHeightLayoutCache.java:1461) at javax.swing.plaf.synth.SynthTreeUI.paint(SynthTreeUI.java:286) at javax.swing.plaf.synth.SynthTreeUI.update(SynthTreeUI.java:226) at javax.swing.JComponent.paintComponent(JComponent.java:752) at javax.swing.JComponent.paint(JComponent.java:1029) at org.openide.explorer.view.TreeView$ExplorerTree.access$1301(TreeView.java:1844) at org.openide.explorer.view.TreeView$ExplorerTree.guardedPaint(TreeView.java:1981) at org.openide.explorer.view.TreeView$ExplorerTree.access$1700(TreeView.java:1844) at org.openide.explorer.view.TreeView$ExplorerTree$GuardedActions.run(TreeView.java:2275) at org.openide.util.Mutex.readAccess(Mutex.java:330) at org.openide.util.Mutex$1R.run(Mutex.java:1305) at org.openide.nodes.Children$ProjectManagerDeadlockDetector.execute(Children.java:1920) at org.openide.util.Mutex.doWrapperAccess(Mutex.java:1326) at org.openide.util.Mutex.readAccess(Mutex.java:278) at org.openide.explorer.view.TreeView$ExplorerTree$GuardedActions.(TreeView.java:2267) at org.openide.explorer.view.TreeView$ExplorerTree.paint(TreeView.java:1952) at javax.swing.JComponent.paintToOffscreen(JComponent.java:5124) at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:278) at javax.swing.RepaintManager.paint(RepaintManager.java:1224) at javax.swing.JComponent.paintForceDoubleBuffered(JComponent.java:1065) at javax.swing.JViewport.blitDoubleBuffered(JViewport.java:1612) at javax.swing.JViewport.windowBlitPaint(JViewport.java:1573) at javax.swing.JViewport.setViewPosition(JViewport.java:1118) at javax.swing.plaf.basic.BasicScrollPaneUI$Handler.vsbStateChanged(BasicScrollPaneUI.java:1029) at javax.swing.plaf.basic.BasicScrollPaneUI$Handler.stateChanged(BasicScrollPaneUI.java:1018) at javax.swing.DefaultBoundedRangeModel.fireStateChanged(DefaultBoundedRangeModel.java:348) at javax.swing.DefaultBoundedRangeModel.setRangeProperties(DefaultBoundedRangeModel.java:285) at javax.swing.DefaultBoundedRangeModel.setValue(DefaultBoundedRangeModel.java:151) at javax.swing.JScrollBar.setValue(JScrollBar.java:446) at javax.swing.plaf.basic.BasicScrollBarUI$TrackListener.setValueFrom(BasicScrollBarUI.java:1220) at javax.swing.plaf.basic.BasicScrollBarUI$TrackListener.mouseDragged(BasicScrollBarUI.java:1162) at java.awt.Component.processMouseMotionEvent(Component.java:6336) at javax.swing.JComponent.processMouseMotionEvent(JComponent.java:3285) at java.awt.Component.processEvent(Component.java:6057) at java.awt.Container.processEvent(Container.java:2041) at java.awt.Component.dispatchEventImpl(Component.java:4651) at java.awt.Container.dispatchEventImpl(Container.java:2099) at java.awt.Component.dispatchEvent(Component.java:4481) at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4577) at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4255) 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:4481) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:643) at java.awt.EventQueue.access$000(EventQueue.java:84) at java.awt.EventQueue$1.run(EventQueue.java:602) at java.awt.EventQueue$1.run(EventQueue.java:600) at java.security.AccessController.doPrivileged(AccessController.java:0) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98) at java.awt.EventQueue$2.run(EventQueue.java:616) at java.awt.EventQueue$2.run(EventQueue.java:614) at java.security.AccessController.doPrivileged(AccessController.java:0) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) at java.awt.EventQueue.dispatchEvent(EventQueue.java:613) at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:162) 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)