java.util.ConcurrentModificationException
   at java.util.Vector$Itr.checkForComodification(Vector.java:1184)
   at java.util.Vector$Itr.next(Vector.java:1137)
   at javax.swing.plaf.basic.BasicDirectoryModel$LoadFilesThread.cancelRunnables(BasicDirectoryModel.java:340)
   at javax.swing.plaf.basic.BasicDirectoryModel$LoadFilesThread.cancelRunnables(BasicDirectoryModel.java:346)
   at javax.swing.plaf.basic.BasicDirectoryModel.validateFileCache(BasicDirectoryModel.java:135)
   at javax.swing.plaf.basic.BasicDirectoryModel.propertyChange(BasicDirectoryModel.java:69)
   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 java.awt.Component.firePropertyChange(Component.java:8422)
   at javax.swing.JFileChooser.setCurrentDirectory(JFileChooser.java:598)
   at javax.swing.JFileChooser.setSelectedFile(JFileChooser.java:502)
   at javax.swing.JFileChooser.setSelectedFiles(JFileChooser.java:539)
   at org.netbeans.modules.quickfilechooser.ChooserComponentUI.refreshCompletions(ChooserComponentUI.java:477)
   at org.netbeans.modules.quickfilechooser.ChooserComponentUI.access$300(ChooserComponentUI.java:99)
   at org.netbeans.modules.quickfilechooser.ChooserComponentUI$5.propertyChange(ChooserComponentUI.java:407)
   at java.beans.PropertyChangeSupport.fire(PropertyChangeSupport.java:335)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:327)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:263)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:283)
   at java.awt.Component.firePropertyChange(Component.java:8462)
   at javax.swing.JComponent.firePropertyChange(JComponent.java:4516)
   at javax.swing.JFileChooser.setFileSelectionMode(JFileChooser.java:1331)
   at org.netbeans.modules.project.ui.ProjectChooserAccessory.createProjectChooser(ProjectChooserAccessory.java:431)
   at org.netbeans.modules.project.ui.actions.OpenProject.actionPerformed(OpenProject.java:86)
   at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
   at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2346)
   at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
   at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
   at javax.swing.AbstractButton.doClick(AbstractButton.java:376)
   at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:833)
   at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:877)
   at java.awt.Component.processMouseEvent(Component.java:6525)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
   at java.awt.Component.processEvent(Component.java:6290)
   at java.awt.Container.processEvent(Container.java:2234)
   at java.awt.Component.dispatchEventImpl(Component.java:4881)
   at java.awt.Container.dispatchEventImpl(Container.java:2292)
   at java.awt.Component.dispatchEvent(Component.java:4703)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4898)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4533)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4462)
   at java.awt.Container.dispatchEventImpl(Container.java:2278)
   at java.awt.Window.dispatchEventImpl(Window.java:2750)
   at java.awt.Component.dispatchEvent(Component.java:4703)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
   at java.awt.EventQueue.access$500(EventQueue.java:97)
   at java.awt.EventQueue$3.run(EventQueue.java:709)
   at java.awt.EventQueue$3.run(EventQueue.java:703)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86)
   at java.awt.EventQueue$4.run(EventQueue.java:731)
   at java.awt.EventQueue$4.run(EventQueue.java:729)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)