Not working with team fortress 2

[jaidenlabelle]

I get this error every time i attempt to load a tf2 map

Unhandled Exception: System.ArgumentException: Value does not fall within the expected range. at SourceUtils.ValvePackage..ctor(String dirFilePath) in C:\Users\James\Documents\GitHub\SourceUtils\SourceUtils\ValvePackage.cs:line 144 at SourceUtils.WebExport.Program.SetBaseOptions(BaseOptions args) in C:\Users\James\Documents\GitHub\SourceUtils\SourceUtils.WebExport\Program.cs:line 119 at SourceUtils.WebExport.Program.Export(ExportOptions args) in C:\Users\James\Documents\GitHub\SourceUtils\SourceUtils.WebExport\Export.cs:line 265 at CommandLine.ParserResultExtensions.MapResult[T1,T2,TResult](ParserResult1 result, Func2 parsedFunc1, Func2 parsedFunc2, Func2 notParsedFunc) at SourceUtils.WebExport.Program.Main(String[] args) in C:\Users\James\Documents\GitHub\SourceUtils\SourceUtils.WebExport\Program.cs:line 173

Assistance would be very much appreciated