ArgumentOutOfRangeException when trying to create prefab torpedo shots (Bullets)

ArgumentOutOfRangeException: Argument is out of range. Parameter name: index System.Collections.Generic.List`1[UnityEngine.GameObject].get_Item (Int32 index) (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System.Collections.Generic/List.cs:633) Player.CreateTorpedo () (at Assets/Scripts/Player.cs:65)

I Used These Two Classes to make the torpedo shots(torpedos are the same mechanics as "bullets")

(Scroll the codes to the Right to see some long lines)

//--------------------------TORPEDO.CS---------------------------

 using UnityEngine;
 using System.Collections;
 
 public class Torpedo : MonoBehaviour 
 {
     public GameObject torpedo;
     private float speed;
 
     void Start () 
     {
         speed = 30f;
     }
 
     void Update () 
     {
         torpedo.transform.position += new Vector3 (speed,     0, 0) * Time.deltaTime;
 
         if (torpedo.transform.position.x > Camera.main.ViewportToWorldPoint (new Vector3 (1, 0, 0)).x)
         {
             torpedo.SetActive (false);
         }
     }
 }

//---------------------------PLAYER.CS---------------------------

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class Player : MonoBehaviour 
 {
     public List<GameObject> torpedoList;
     //-----------------------
     public GameObject player;
     public GameObject prefab;
     //-----------------------
     private float speed;
     private float interval;
     private float timer;
     //-----------------------
     private bool flip;
 
     void Start () 
     {
         player.transform.position = new Vector3 (0, 2.3f, -0.69f);
         torpedoList = new List<GameObject>();
         speed = .125f;
         flip = false;
         timer = 0f;
         interval = .05f;
     }
     void Update () 
     {
         if (Input.GetKey (KeyCode.RightArrow) && player.transform.position.x < 6.25)
         {
             player.transform.position += new Vector3 (speed, 0, 0);
             player.transform.eulerAngles = new Vector3 (0, 0, 0);
             flip = false;
         }
         if (Input.GetKey (KeyCode.LeftArrow) && player.transform.position.x > -6.25)
         {
             player.transform.position -= new Vector3 (speed, 0, 0);
             player.transform.eulerAngles = new Vector3 (0, 180, 0);
             flip = true;
         }
         if (Input.GetKey (KeyCode.UpArrow) && player.transform.position.y < 2.432)
         {
             player.transform.position += new Vector3 (0, speed, 0);
         }
         if (Input.GetKey (KeyCode.DownArrow) && player.transform.position.y > -3.45)
         {
             player.transform.position -= new Vector3 (0, speed, 0);
         }
         if (Input.GetKey (KeyCode.S) && !flip)
         {
             timer+= Time.deltaTime;
             if (timer > interval)
             {
                 CreateTorpedo ();
                 timer = 0f;
             }
         }
     }
     private void CreateTorpedo ()
     {
         GameObject torpTemp = null;
 
         for (int i = 0; i < 12; i++)
         {
             if (torpedoList[i].activeSelf == false)
             {
                 torpTemp = torpedoList[i];
                 torpTemp.SetActive(true);
                 break;
             }
         }
         if (torpTemp != null)
         {
             torpTemp.transform.position = new Vector3
                 (transform.position.x + 1.7f, transform.position.y + 1.5f, transform.position.z);
         }
     }
 }