java.lang.AssertionError: LetExpr is not part of a public API at com.sun.tools.javac.tree.JCTree$LetExpr.getKind(JCTree.java:2642) at com.sun.source.util.TreePath.(TreePath.java:107) at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:70) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$UsagesVisitor.scan(SourceAnalyzerFactory.java:400) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$UsagesVisitor.scan(SourceAnalyzerFactory.java:295) at com.sun.source.util.TreeScanner.visitExpressionStatement(TreeScanner.java:434) at com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1430) at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:72) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$UsagesVisitor.scan(SourceAnalyzerFactory.java:400) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$UsagesVisitor.scan(SourceAnalyzerFactory.java:295) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:106) at com.sun.source.util.TreeScanner.visitBlock(TreeScanner.java:249) at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1002) at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:72) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$UsagesVisitor.scan(SourceAnalyzerFactory.java:400) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$UsagesVisitor.scan(SourceAnalyzerFactory.java:295) at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:91) at com.sun.source.util.TreeScanner.visitIf(TreeScanner.java:421) at com.sun.tools.javac.tree.JCTree$JCIf.accept(JCTree.java:1403) at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:72) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$UsagesVisitor.scan(SourceAnalyzerFactory.java:400) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$UsagesVisitor.scan(SourceAnalyzerFactory.java:295) at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:91) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:106) at com.sun.source.util.TreeScanner.visitBlock(TreeScanner.java:249) at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1002) at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:72) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$UsagesVisitor.scan(SourceAnalyzerFactory.java:400) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$UsagesVisitor.scan(SourceAnalyzerFactory.java:295) at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:91) at com.sun.source.util.TreeScanner.visitIf(TreeScanner.java:420) at com.sun.tools.javac.tree.JCTree$JCIf.accept(JCTree.java:1403) at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:72) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$UsagesVisitor.scan(SourceAnalyzerFactory.java:400) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$UsagesVisitor.scan(SourceAnalyzerFactory.java:295) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:106) at com.sun.source.util.TreeScanner.visitBlock(TreeScanner.java:249) at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1002) at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:72) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$UsagesVisitor.scan(SourceAnalyzerFactory.java:400) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$UsagesVisitor.scan(SourceAnalyzerFactory.java:295) at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:91) at com.sun.source.util.TreeScanner.visitMethod(TreeScanner.java:207) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$UsagesVisitor.visitMethod(SourceAnalyzerFactory.java:773) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$UsagesVisitor.visitMethod(SourceAnalyzerFactory.java:295) at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:874) at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:72) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$UsagesVisitor.scan(SourceAnalyzerFactory.java:400) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$UsagesVisitor.scan(SourceAnalyzerFactory.java:295) at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:91) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:106) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$UsagesVisitor.visitClass(SourceAnalyzerFactory.java:720) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$UsagesVisitor.visitClass(SourceAnalyzerFactory.java:295) at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:782) at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:72) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$UsagesVisitor.scan(SourceAnalyzerFactory.java:400) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$UsagesVisitor.scan(SourceAnalyzerFactory.java:295) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:106) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$UsagesVisitor.visitCompilationUnit(SourceAnalyzerFactory.java:417) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$UsagesVisitor.visitCompilationUnit(SourceAnalyzerFactory.java:295) at com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:563) at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:72) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$UsagesVisitor.scan(SourceAnalyzerFactory.java:400) at org.netbeans.modules.java.source.usages.SourceAnalyzerFactory$StorableAnalyzer.analyse(SourceAnalyzerFactory.java:157) at org.netbeans.modules.java.source.indexing.JavaParsingContext.analyze(JavaParsingContext.java:233) at org.netbeans.modules.java.source.indexing.MultiPassCompileWorker.compile(MultiPassCompileWorker.java:294) at org.netbeans.modules.java.source.indexing.JavaCustomIndexer.index(JavaCustomIndexer.java:261) at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor$2.run(Indexable.java:161) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runIndexer(RepositoryUpdater.java:298) at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor.index(Indexable.java:159) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doIndex(RepositoryUpdater.java:2773) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.access$800(RepositoryUpdater.java:2177) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$1.run(RepositoryUpdater.java:2659) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$1.run(RepositoryUpdater.java:2657) at org.netbeans.modules.parsing.impl.indexing.errors.TaskCache.refreshTransaction(TaskCache.java:565) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.index(RepositoryUpdater.java:2657) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$3.call(RepositoryUpdater.java:3310) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$3.call(RepositoryUpdater.java:3276) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$4.run(RepositoryUpdater.java:2150) at org.openide.util.lookup.Lookups.executeWith(Lookups.java:304) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runInContext(RepositoryUpdater.java:2146) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runInContext(RepositoryUpdater.java:2127) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.access$1500(RepositoryUpdater.java:159) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.scanFiles(RepositoryUpdater.java:3276) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$FileListWork.getDone(RepositoryUpdater.java:3795) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doTheWork(RepositoryUpdater.java:3430) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task._run(RepositoryUpdater.java:6193) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.access$4300(RepositoryUpdater.java:5844) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2$1.run(RepositoryUpdater.java:6109) at org.openide.util.lookup.Lookups.executeWith(Lookups.java:304) at org.netbeans.modules.parsing.impl.RunWhenScanFinishedSupport.performScan(RunWhenScanFinishedSupport.java:106) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2.call(RepositoryUpdater.java:6105) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2.call(RepositoryUpdater.java:6101) at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176) at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360) at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:141) at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:88) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.run(RepositoryUpdater.java:6101) 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)