org.netbeans.modules.vcscore.VcsFileSystem$FileLockUserQuestionException: Do you want to checkout the file to make it writable?
	at org.netbeans.modules.vcscore.VcsFileSystem.lock(VcsFileSystem.java:4096)
	at org.openide.filesystems.AbstractFileObject.lock(AbstractFileObject.java:200)
	at org.netbeans.modules.masterfs.Delegate$FileLockImpl.lock(Delegate.java:282)
	at org.netbeans.modules.masterfs.Delegate$FileLockImpl.access$200(Delegate.java:252)
	at org.netbeans.modules.masterfs.Delegate.lock(Delegate.java:157)
	at org.netbeans.modules.masterfs.MasterFileObject.lock(MasterFileObject.java:139)
	at org.netbeans.spi.project.support.ant.ProjectProperties$1.run(ProjectProperties.java:200)
	at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:89)
	at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:432)
	at org.netbeans.spi.project.support.ant.ProjectProperties$PP.write(ProjectProperties.java:192)
	at org.netbeans.spi.project.support.ant.ProjectProperties.write(ProjectProperties.java:97)
	at org.netbeans.spi.project.support.ant.AntProjectHelper.save(AntProjectHelper.java:397)
	at org.netbeans.spi.project.support.ant.AntProjectHelper.access$100(AntProjectHelper.java:57)
	at org.netbeans.spi.project.support.ant.AntProjectHelper$1.save(AntProjectHelper.java:95)
	at org.netbeans.modules.project.ant.AntBasedProjectFactorySingleton.saveProject(AntBasedProjectFactorySingleton.java:141)
	at org.netbeans.api.project.ProjectManager$7.run(ProjectManager.java:431)
	at org.openide.util.Mutex.writeAccess(Mutex.java:298)
	at org.netbeans.api.project.ProjectManager.saveProject(ProjectManager.java:424)
	at org.netbeans.modules.web.project.ui.customizer.WebProjectProperties$1.run(WebProjectProperties.java:401)
	at org.openide.util.Mutex.writeAccess(Mutex.java:298)
	at org.netbeans.modules.web.project.ui.customizer.WebProjectProperties.store(WebProjectProperties.java:327)
	at org.netbeans.modules.web.project.ui.WebCustomizerProvider$OptionListener.actionPerformed(WebCustomizerProvider.java:126)
	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1836)
	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2154)
	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
	at javax.swing.AbstractButton.doClick(AbstractButton.java:302)
	at javax.swing.plaf.basic.BasicRootPaneUI$Actions.actionPerformed(BasicRootPaneUI.java:190)
	at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1569)
	at javax.swing.JComponent.processKeyBinding(JComponent.java:2718)
	at javax.swing.KeyboardManager.fireBinding(KeyboardManager.java:255)
	at javax.swing.KeyboardManager.fireKeyboardAction(KeyboardManager.java:204)
	at javax.swing.JComponent.processKeyBindingsForAllComponents(JComponent.java:2795)
	at javax.swing.JComponent.processKeyBindings(JComponent.java:2787)
	at javax.swing.JComponent.processKeyEvent(JComponent.java:2681)
	at java.awt.Component.processEvent(Component.java:5242)
	at java.awt.Container.processEvent(Container.java:1961)
	at java.awt.Component.dispatchEventImpl(Component.java:3933)
	at java.awt.Container.dispatchEventImpl(Container.java:2019)
	at java.awt.Component.dispatchEvent(Component.java:3781)
	at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1804)
	at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:668)
	at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:916)
	at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:794)
	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:632)
	at java.awt.Component.dispatchEventImpl(Component.java:3819)
	at java.awt.Container.dispatchEventImpl(Container.java:2019)
	at java.awt.Window.dispatchEventImpl(Window.java:1764)
	at java.awt.Component.dispatchEvent(Component.java:3781)
[catch] at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)