Scene is loading/not loaded

My scene continuously says is loading and not loaded and I can not play properly (see images). I don't get any error message or warning. I don't know if there is an error in the code (if yes, I don't know which part to import here because it is too long), I don't think this is a common thing because I couldn't find anything in the forums. If there is a way to fix it please help. It was working fine till I added this to Update() function:

 if (health <= 0)
         {
             RestartGame();
         }

And added this to void OnControllerColliderHit (ControllerColliderHit c)

 if (c.gameObject.tag == "enemy")
         {
             AudioSource audio1 = GetComponent<AudioSource>();
             audio1.PlayOneShot(hurt);
             health -= 25; 
         }

I had this before :

 void RestartGame()
     {
         StartCoroutine(Wait3secs());
         Application.LoadLevel(Application.loadedLevel);
     }