java.lang.AssertionError
   at com.sun.tools.javac.util.Assert.error(Assert.java:155)
   at com.sun.tools.javac.comp.Resolve.resolveSelf(Resolve.java:3542)
   at com.sun.tools.javac.comp.Attr.selectSym(Attr.java:3781)
   at com.sun.tools.javac.comp.Attr.visitSelect(Attr.java:3657)
   at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:2110)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:502)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:643)
   at com.sun.tools.javac.comp.Attr.visitSelect(Attr.java:3629)
   at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:2110)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:502)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:643)
   at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1941)
   at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1634)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:502)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:643)
   at com.sun.tools.javac.comp.Attr.visitReturn(Attr.java:1793)
   at com.sun.tools.javac.tree.JCTree$JCReturn.accept(JCTree.java:1546)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:502)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:643)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:713)
   at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:737)
   at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1221)
   at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:82)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1020)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:502)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:643)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:713)
   at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:1107)
   at org.netbeans.lib.nbjavac.services.NBAttr.visitMethodDef(NBAttr.java:76)
   at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:872)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:502)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:643)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:713)
   at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4785)
   at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4669)
   at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4597)
   at com.sun.tools.javac.api.JavacTrees.getElement(JavacTrees.java:425)
   at com.sun.tools.javac.api.JavacTrees.getElement(JavacTrees.java:163)
   at org.netbeans.modules.java.editor.base.semantic.SemanticHighlighterBase$DetectorVisitor.visitMethodInvocation(SemanticHighlighterBase.java:965)
   at org.netbeans.modules.java.editor.base.semantic.SemanticHighlighterBase$DetectorVisitor.visitMethodInvocation(SemanticHighlighterBase.java:453)
   at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1650)
   at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:94)
   at com.sun.source.util.TreeScanner.visitExpressionStatement(TreeScanner.java:433)
   at org.netbeans.modules.java.editor.base.semantic.SemanticHighlighterBase$DetectorVisitor.visitExpressionStatement(SemanticHighlighterBase.java:1130)
   at org.netbeans.modules.java.editor.base.semantic.SemanticHighlighterBase$DetectorVisitor.visitExpressionStatement(SemanticHighlighterBase.java:453)
   at com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1460)
   at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:94)
   at com.sun.source.util.TreeScanner.scan(TreeScanner.java:105)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:103)
   at com.sun.source.util.TreeScanner.visitBlock(TreeScanner.java:248)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1032)
   at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:94)
   at org.netbeans.modules.java.editor.base.semantic.SemanticHighlighterBase$DetectorVisitor.visitMethod(SemanticHighlighterBase.java:1117)
   at org.netbeans.modules.java.editor.base.semantic.SemanticHighlighterBase$DetectorVisitor.visitMethod(SemanticHighlighterBase.java:453)
   at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:904)
   at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:94)
   at com.sun.source.util.TreeScanner.scan(TreeScanner.java:105)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:103)
   at org.netbeans.modules.java.editor.base.semantic.SemanticHighlighterBase$DetectorVisitor.visitClass(SemanticHighlighterBase.java:1387)
   at org.netbeans.modules.java.editor.base.semantic.SemanticHighlighterBase$DetectorVisitor.visitClass(SemanticHighlighterBase.java:453)
   at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:812)
   at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:94)
   at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:90)
   at com.sun.source.util.TreeScanner.scan(TreeScanner.java:105)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:103)
   at org.netbeans.modules.java.editor.base.semantic.SemanticHighlighterBase$DetectorVisitor.visitClass(SemanticHighlighterBase.java:1387)
   at org.netbeans.modules.java.editor.base.semantic.SemanticHighlighterBase$DetectorVisitor.visitClass(SemanticHighlighterBase.java:453)
   at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:812)
   at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:94)
   at com.sun.source.util.TreeScanner.scan(TreeScanner.java:105)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:103)
   at org.netbeans.modules.java.editor.base.semantic.SemanticHighlighterBase$DetectorVisitor.visitCompilationUnit(SemanticHighlighterBase.java:819)
   at org.netbeans.modules.java.editor.base.semantic.SemanticHighlighterBase$DetectorVisitor.visitCompilationUnit(SemanticHighlighterBase.java:453)
   at com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:593)
   at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:82)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:94)
   at org.netbeans.modules.java.editor.base.semantic.SemanticHighlighterBase.process(SemanticHighlighterBase.java:295)
   at org.netbeans.modules.java.editor.semantic.SemanticHighlighter.process(SemanticHighlighter.java:76)
   at org.netbeans.modules.java.editor.base.semantic.SemanticHighlighterBase.run(SemanticHighlighterBase.java:162)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:584)
   at org.netbeans.modules.parsing.impl.TaskProcessor$RequestPerformer.run(TaskProcessor.java:809)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:304)
   at org.netbeans.modules.parsing.impl.TaskProcessor$RequestPerformer.execute(TaskProcessor.java:725)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:686)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
   at java.util.concurrent.FutureTask.run(FutureTask.java:266)
   at org.openide.util.RequestProcessor$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)