Level Start error :/

Hi... Im here newbie and im making FPS game...

I made this script...(For now im using or just trying to use singleplayer so thats why it has only aplication....)

So...This is my code: using UnityEngine; using System.Collections;

namespace mainMenuScript { public class mainMenuScript : MonoBehaviour { public void mainMenuSinglePlayerPlay() { Debug.Log("mainMenu # Starting Singleplayer scene"); Aplication.LoadLevel(si_test); }

     public void mainMenuMultiPlayerPlay()
     {
         Debug.Log("mainMenu # Starting Multiplayer scene");
     }

     public void mainMenuSettings()
     {
         Debug.Log("mainMenu # Starting Settings scene");

     }

     public void mainMenuExit()
     {
         Debug.Log("mainMenu # Exit...");
         Debug.Log("Exiting game!");
     }
 }

}

Console says this: https://gyazo.com/94f375e2b5ae49dbd8dda8e540784eec

In my build settings i got:

mainmenu.unity si_test.unity (SINGLEPLAYER MAP)