java.lang.AssertionError
        at org.netbeans.api.java.source.JavaSource$JavaSourceAccessorImpl.getJavacTask(JavaSource.java:732)
        at org.netbeans.modules.java.source.pretty.VeryPretty.<init>(VeryPretty.java:162)
        at org.netbeans.modules.java.source.pretty.VeryPretty.<init>(VeryPretty.java:168)
        at org.netbeans.modules.java.source.pretty.VeryPretty.printAnnotationsFormatted(VeryPretty.java:1584)
        at org.netbeans.modules.java.source.pretty.VeryPretty.printAnnotations(VeryPretty.java:1607)
        at org.netbeans.modules.java.source.pretty.VeryPretty.visitMethodDef(VeryPretty.java:560)
        at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:656)
        at org.netbeans.modules.java.source.pretty.VeryPretty.doAccept(VeryPretty.java:267)
        at org.netbeans.modules.java.source.pretty.VeryPretty.printExpr(VeryPretty.java:1719)
        at org.netbeans.modules.java.source.pretty.VeryPretty.printStat(VeryPretty.java:1749)
        at org.netbeans.modules.java.source.pretty.VeryPretty.visitClassDef(VeryPretty.java:539)
        at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:587)
        at org.netbeans.modules.java.source.pretty.VeryPretty.doAccept(VeryPretty.java:267)
        at org.netbeans.modules.java.source.pretty.VeryPretty.printExpr(VeryPretty.java:1719)
        at org.netbeans.modules.java.source.pretty.VeryPretty.printStat(VeryPretty.java:1749)
        at org.netbeans.modules.java.source.pretty.VeryPretty.visitTopLevel(VeryPretty.java:409)
        at com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:450)
        at org.netbeans.modules.java.source.pretty.VeryPretty.doAccept(VeryPretty.java:267)
        at org.netbeans.modules.java.source.pretty.VeryPretty.print(VeryPretty.java:259)
        at org.netbeans.api.java.source.WorkingCopy.processExternalCUs(WorkingCopy.java:486)
        at org.netbeans.api.java.source.WorkingCopy.getChanges(WorkingCopy.java:506)
        at org.netbeans.api.java.source.JavaSource$1.run(JavaSource.java:657)
        at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:129)
        at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:113)
        at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:190)
        at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:99)
        at org.netbeans.api.java.source.JavaSource.runModificationTask(JavaSource.java:669)
        at org.netbeans.modules.refactoring.java.spi.JavaRefactoringPlugin.processFiles(JavaRefactoringPlugin.java:245)
        at org.netbeans.modules.refactoring.java.spi.JavaRefactoringPlugin.createAndAddElements(JavaRefactoringPlugin.java:255)
        at org.netbeans.modules.refactoring.java.spi.JavaRefactoringPlugin.createAndAddElements(JavaRefactoringPlugin.java:271)
        at org.netbeans.modules.refactoring.java.plugins.InnerToOuterRefactoringPlugin.prepare(InnerToOuterRefactoringPlugin.java:210)
        at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsPrepare2(AbstractRefactoring.java:419)
        at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsPrepare(AbstractRefactoring.java:403)
        at org.netbeans.modules.refactoring.api.AbstractRefactoring.prepare(AbstractRefactoring.java:214)
        at org.netbeans.modules.refactoring.spi.impl.ParametersPanel$Prepare.run(ParametersPanel.java:803)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:602)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1084)