java.lang.Throwable: Can't unlock file Windows2Local/Modes/.nbattrs, it's lock was not found or it wasn't locked.
        at org.netbeans.core.startup.layers.LocalFileSystemEx.unlock(LocalFileSystemEx.java:155)
        at org.openide.filesystems.LocalFileSystem$Impl.unlock(LocalFileSystem.java:666)
        at org.openide.filesystems.DefaultAttributes.deleteFile(DefaultAttributes.java:774)
        at org.openide.filesystems.DefaultAttributes.saveTable(DefaultAttributes.java:601)
        at org.openide.filesystems.DefaultAttributes.writeAttribute(DefaultAttributes.java:436)
        at org.netbeans.core.startup.layers.LocalFileSystemEx$DelegatingAttributes.writeAttribute(LocalFileSystemEx.java:180)
        at org.openide.filesystems.AbstractFileObject.setAttribute(AbstractFileObject.java:350)
        at org.openide.filesystems.MultiFileObject.setAttribute(MultiFileObject.java:875)
        at org.openide.filesystems.MultiFileObject.setAttribute(MultiFileObject.java:875)
        at org.openide.filesystems.MultiFileObject.setAttribute(MultiFileObject.java:845)
        at org.netbeans.spi.palette.PaletteVisibility.setVisible(PaletteVisibility.java:87)
        at org.netbeans.spi.palette.PaletteSwitch.showHidePaletteTopComponent(PaletteSwitch.java:256)
        at org.netbeans.spi.palette.PaletteSwitch.run(PaletteSwitch.java:142)
        at org.netbeans.spi.palette.PaletteSwitch$1.propertyChange(PaletteSwitch.java:310)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
        at org.netbeans.core.windows.RegistryImpl.doFirePropertyChange(RegistryImpl.java:314)
        at org.netbeans.core.windows.RegistryImpl.access$100(RegistryImpl.java:63)
        at org.netbeans.core.windows.RegistryImpl$1.run(RegistryImpl.java:166)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)