HRESULT E_FAIL has been returned from a call to a COM component. Hogy tudom "megjavítani"?

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Speech.Recognition;

using System.Speech.Synthesis;

namespace ConsoleApp1

{

class Program

{

private static SpeechRecognitionEngine engine;

static void Main(string[] args)

{

engine = new SpeechRecognitionEngine();

engine.SetInputToDefaultAudioDevice(); // <---

engine.LoadGrammar(new DictationGrammar());

engine.RecognizeAsync(RecognizeMode.Multiple);

engine.SpeechRecognized += rec;

Console.ReadKey();

}

private static void rec(object sender, SpeechRecognizedEventArgs result)

{

Console.WriteLine("You said: {0} Conf: {1}", result.Result.Text, result.Result.Confidence);

}

}

}

"