An exception has been encountered.

[r-henley]

It's not complicated, the LUA file that creates this error someplace in it when switching to the file tab:

System.InvalidOperationException: Stack empty.

at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
at System.Collections.Generic.Stack1.Pop() at LanguageService.Parser.ParseBlock(ParsingContext context) at LanguageService.Parser.ParseFunctionBody() at LanguageService.Parser.ParseFunctionDef() at LanguageService.Parser.ParseExpression() at LanguageService.Parser.ParseField() at LanguageService.Parser.ParseListElement(ParsingContext context) at LanguageService.Parser.ParseSeparatedList(ParsingContext context) at LanguageService.Parser.ParseTableConstructorArg() at LanguageService.Parser.ParseArgs() at LanguageService.Parser.ParseFunctionCallPrefixp(PrefixExp prefixExp) at LanguageService.Parser.ParsePrefixExp(PrefixExp prefixExp, Boolean parsingFunctionCallStatement) at LanguageService.Parser.ParseExpression() at LanguageService.Parser.ParseListElement(ParsingContext context) at LanguageService.Parser.ParseSeparatedList(ParsingContext context) at LanguageService.Parser.ParseParenArg() at LanguageService.Parser.ParseArgs() at LanguageService.Parser.ParseFunctionCallPrefixp(PrefixExp prefixExp) at LanguageService.Parser.ParsePrefixExp(PrefixExp prefixExp, Boolean parsingFunctionCallStatement) at LanguageService.Parser.ParseStatement() at LanguageService.Parser.ParseBlock(ParsingContext context) at LanguageService.Parser.ParseFunctionBody() at LanguageService.Parser.ParseGlobalFunctionStatementNode() at LanguageService.Parser.ParseStatement() at LanguageService.Parser.ParseBlock(ParsingContext context) at LanguageService.Parser.ParseChunkNode() at LanguageService.Parser.CreateSyntaxTreeInner(TextReader luaReader) at LanguageService.ParseTreeCache.Get(SourceText sourceText) at LanguageService.Diagnostics.DiagnosticsProvider.GetDiagnostics(SourceText sourceText) at Microsoft.VisualStudio.LanguageServices.Lua.Errors.ErrorTagger.<GetTags>d__7.MoveNext() at Microsoft.VisualStudio.Text.Tagging.Implementation.TagAggregator1.<GetTagsForBuffer>d__38.MoveNext()

I had to uninstall this extension, it is not ready for use.