org.netbeans.modules.form.PersistenceException: Cannot write to form file
   at org.netbeans.modules.form.GandalfPersistenceManager.saveForm(GandalfPersistenceManager.java:3207)
   at org.netbeans.modules.form.FormEditor.saveFormData(FormEditor.java:413)
   at org.netbeans.modules.form.refactoring.FormRefactoringUpdate.updateForm(FormRefactoringUpdate.java:536)
   at org.netbeans.modules.form.refactoring.FormRefactoringUpdate.formMove2(FormRefactoringUpdate.java:369)
   at org.netbeans.modules.form.refactoring.FormRefactoringUpdate.formMove(FormRefactoringUpdate.java:357)
   at org.netbeans.modules.form.refactoring.FormRefactoringUpdate.performChange(FormRefactoringUpdate.java:275)
   at org.netbeans.modules.refactoring.api.RefactoringSession.doRefactoring(RefactoringSession.java:172)
   at org.netbeans.modules.refactoring.spi.impl.ParametersPanel$9.run(ParametersPanel.java:479)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1452)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2032)