java.lang.AssertionError
   at com.sun.tools.javac.util.Assert.error(Assert.java:155)
   at com.sun.tools.javac.util.Assert.check(Assert.java:46)
   at com.sun.tools.javac.comp.Annotate$1.run(Annotate.java:234)
   at com.sun.tools.javac.comp.Annotate.flush(Annotate.java:173)
   at com.sun.tools.javac.code.ClassFinder.complete(ClassFinder.java:311)
   at com.sun.tools.javac.code.ClassFinder.access$000(ClassFinder.java:75)
   at com.sun.tools.javac.code.ClassFinder$1.complete(ClassFinder.java:169)
   at com.sun.tools.javac.code.Symbol.complete(Symbol.java:591)
   at com.sun.tools.javac.model.JavacElements.nameToSymbol(JavacElements.java:165)
   at com.sun.tools.javac.model.JavacElements.getPackageElement(JavacElements.java:97)
   at com.sun.tools.javac.model.JavacElements.getPackageElement(JavacElements.java:65)
   at org.netbeans.modules.java.source.save.ElementOverlay.resolve(ElementOverlay.java:215)
   at org.netbeans.modules.java.source.save.ElementOverlay.wrap(ElementOverlay.java:368)
   at org.netbeans.modules.java.source.save.ElementOverlay.wrap(ElementOverlay.java:378)
   at org.netbeans.modules.java.source.save.ElementOverlay.access$300(ElementOverlay.java:92)
   at org.netbeans.modules.java.source.save.ElementOverlay$PackageElementWrapper.getEnclosedElements(ElementOverlay.java:773)
   at org.netbeans.modules.java.source.pretty.ImportAnalysis2.setImports(ImportAnalysis2.java:164)
   at org.netbeans.modules.java.source.transform.ImmutableTreeTranslator.rewriteChildren(ImmutableTreeTranslator.java:547)
   at org.netbeans.modules.java.source.transform.ImmutableTreeTranslator.visitCompilationUnit(ImmutableTreeTranslator.java:345)
   at org.netbeans.modules.java.source.transform.ImmutableTreeTranslator.visitCompilationUnit(ImmutableTreeTranslator.java:97)
   at com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:563)
   at org.netbeans.modules.java.source.transform.ImmutableTreeTranslator.translate(ImmutableTreeTranslator.java:146)
   at org.netbeans.api.java.source.WorkingCopy$5.translate(WorkingCopy.java:882)
   at org.netbeans.api.java.source.WorkingCopy.processCurrentCompilationUnit(WorkingCopy.java:906)
   at org.netbeans.api.java.source.WorkingCopy.getChanges(WorkingCopy.java:1333)
   at org.netbeans.api.java.source.JavaSource$1.run(JavaSource.java:639)
   at org.netbeans.api.java.source.JavaSource$1.run(JavaSource.java:626)
   at org.netbeans.api.java.source.JavaSource$MultiTask.run(JavaSource.java:486)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:609)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:153)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:137)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:204)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:201)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:141)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:88)
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:201)
   at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:104)
   at org.netbeans.api.java.source.JavaSource.runUserActionTaskImpl(JavaSource.java:436)
   at org.netbeans.api.java.source.JavaSource.runUserActionTask(JavaSource.java:407)
   at org.netbeans.api.java.source.JavaSource.runModificationTask(JavaSource.java:647)
   at org.netbeans.modules.refactoring.java.spi.JavaRefactoringPlugin.processFiles(JavaRefactoringPlugin.java:326)
   at org.netbeans.modules.refactoring.java.spi.JavaRefactoringPlugin.processFiles(JavaRefactoringPlugin.java:287)
   at org.netbeans.modules.refactoring.java.spi.JavaRefactoringPlugin.processFiles(JavaRefactoringPlugin.java:269)
   at org.netbeans.modules.refactoring.java.spi.JavaRefactoringPlugin.createAndAddElements(JavaRefactoringPlugin.java:335)
   at org.netbeans.modules.refactoring.java.spi.JavaRefactoringPlugin.createAndAddElements(JavaRefactoringPlugin.java:351)
   at org.netbeans.modules.refactoring.java.plugins.EncapsulateFieldsPlugin.prepare(EncapsulateFieldsPlugin.java:213)
   at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsPrepare2(AbstractRefactoring.java:442)
   at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsPrepare(AbstractRefactoring.java:426)
   at org.netbeans.modules.refactoring.api.AbstractRefactoring.prepare(AbstractRefactoring.java:237)
   at org.netbeans.modules.refactoring.spi.impl.ParametersPanel$Prepare.run(ParametersPanel.java:1090)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)