SendMessage does not launch function (HoloLens / Unity / C #)

Purpose: Transition from one scene to another using auditing.

Problem: Launching the app in the HoloLens emulator opens the first scene. By saying Next Step, HoloLens recognizes the sentence, but sendMessage doesn't open the function OnNextStep()

.

Thanks for the help!:)

using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using UnityEngine.Windows.Speech;
using System.Diagnostics;
using UnityEngine.SceneManagement;

public class KeywordManager : MonoBehaviour {

    KeywordRecognizer keywordRecognizer = null;
    Dictionary<string, System.Action> keywords = new Dictionary<string, System.Action>();

    // Use this for initialization
    void Start () {
        keywords.Add("Next Step", () =>
        {
            SendMessage("OnNextStep", SendMessageOptions.DontRequireReceiver);
        });

        // Tell the KeywordRecognizer about our keywords.
        keywordRecognizer = new KeywordRecognizer(keywords.Keys.ToArray());

        // Register a callback for the KeywordRecognizer and start recognizing!
        keywordRecognizer.OnPhraseRecognized += KeywordRecognizer_OnPhraseRecognized;
        keywordRecognizer.Start();
    }

    private void KeywordRecognizer_OnPhraseRecognized(PhraseRecognizedEventArgs args)
    {
        System.Action keywordAction;
        if(keywords.TryGetValue(args.text, out keywordAction))
        {
            keywordAction.Invoke();
        }
    }

    void OnNextstep()
    {
        UnityEngine.Debug.Log(this);
        SceneManager.LoadScene("FirstStepScene");
    }

    // Update is called once per frame
    void Update () {

    }
}