java.lang.NullPointerException
   at com.sun.tools.javac.api.JavacTrees.getElement(JavacTrees.java:191)
   at org.netbeans.modules.refactoring.java.api.MemberInfo.create(MemberInfo.java:165)
   at org.netbeans.modules.refactoring.java.ui.EncapsulateFieldPanel.initialize(EncapsulateFieldPanel.java:193)
   at org.netbeans.modules.refactoring.java.ui.EncapsulateFieldPanel$1.run(EncapsulateFieldPanel.java:174)
   at org.netbeans.modules.refactoring.java.ui.EncapsulateFieldPanel$1.run(EncapsulateFieldPanel.java:169)
   at org.netbeans.api.java.source.JavaSource$MultiTask.run(JavaSource.java:488)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:583)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:150)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:134)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:200)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:197)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:72)
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:197)
   at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:102)
   at org.netbeans.api.java.source.JavaSource.runUserActionTaskImpl(JavaSource.java:438)
   at org.netbeans.api.java.source.JavaSource.runUserActionTask(JavaSource.java:409)
   at org.netbeans.modules.refactoring.java.ui.EncapsulateFieldPanel.initialize(EncapsulateFieldPanel.java:169)
   at org.netbeans.modules.refactoring.spi.impl.ParametersPanel$11.run(ParametersPanel.java:632)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1452)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2032)