SyntaxError: Unexpected reserved word

[Bizarrus]

I've tryed out these interpreter. An simple console.log will work - But when i try to use ES6 classes, i've got following Exception:

Noesis.Javascript.JavascriptException: SyntaxError: Unexpected reserved word

   bei Noesis.Javascript.CompileScript(Local<v8::Script>* , Char* source_code, Char* resource_name)
   bei Noesis.Javascript.JavascriptContext.Run(String iSourceCode)
   bei ReactSharp.Program.Main(String[] args) in c:\Users\info\Documents\SharpDevelop Projects\ReactSharp\ReactSharp\Program.cs:Zeile 48.

Program.cs

using System;
using System.IO;
using Noesis.Javascript;

namespace Sample {
	public class SystemConsole {
		public SystemConsole() {}

		public void log(string iString) {
			Console.WriteLine(iString);
			System.Diagnostics.Debug.WriteLine(iString);
		}
	}

	internal sealed class Program {
		[STAThread]
		private static void Main(string[] args) {
			System.Diagnostics.Debug.WriteLine("HI");
		
			using(JavascriptContext context = new JavascriptContext()) {
				context.SetParameter("console", new SystemConsole());
				
				// Read the "main.js"
				string contents = File.ReadAllText(@"main.js");
				
				// Run the script
				context.Run(contents);
			}
		}
	}
}

main.js

class Example {
	constructor() {
		console.log("Hello World, APP!");
	}
}

[oliverbock]

You probably need to build from source to get a version that supports ES6 classes. Someone may provide more help if you specify which version of JavaScript.Net you are using, and cut the example down to work out which reserved word is the problem.