java.lang.NullPointerException
   at org.netbeans.modules.refactoring.java.plugins.EncapsulateFieldRefactoringPlugin.getRelevantFiles(EncapsulateFieldRefactoringPlugin.java:459)
   at org.netbeans.modules.refactoring.java.plugins.EncapsulateFieldRefactoringPlugin.prepareEncapsulator(EncapsulateFieldRefactoringPlugin.java:423)
   at org.netbeans.modules.refactoring.java.plugins.EncapsulateFieldRefactoringPlugin.prepare(EncapsulateFieldRefactoringPlugin.java:400)
   at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsPrepare2(AbstractRefactoring.java:437)
   at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsPrepare(AbstractRefactoring.java:421)
   at org.netbeans.modules.refactoring.api.AbstractRefactoring.prepare(AbstractRefactoring.java:232)
   at org.netbeans.modules.java.editor.codegen.GetterSetterGenerator.doDefaultEncapsulate(GetterSetterGenerator.java:311)
   at org.netbeans.modules.java.editor.codegen.GetterSetterGenerator.access$600(GetterSetterGenerator.java:86)
   at org.netbeans.modules.java.editor.codegen.GetterSetterGenerator$3.run(GetterSetterGenerator.java:271)
   at org.netbeans.modules.progress.ui.RunOffEDTImpl$1.run(RunOffEDTImpl.java:169)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)