Creating an array of structs

Hi,

We want to create a priority system for some of our game objects to act in a battle scene and we encountered the following problem:

Our gameobjects have a script called stats and this script calls a GetPriorities function on object spawn. This GetPriorities function exists in another script called TurnSystem which is an empty object's component that is supposed to manage the turns of action of the objects.

The Stats script is:

public class Stats : MonoBehaviour { public int Level; public int HP; public int Damage; public TurnSystem system; public int BattlePriority; // Use this for initialization void Start () {

 }
 
 // Update is called once per frame
 void Update () {
 
 }
 
 void OnSpawned(){
     BattlePriority=system.GetPriority(Level,this.gameObject); <--line 21
 }

}

The turnsystem script is:

using UnityEngine; using System.Collections;

public class TurnSystem : MonoBehaviour {

 public class Turns {
     private int priority;
     private GameObject go;
     
     public int Priority{
          get{
              return priority;
          }
          set{
              priority=value;
          }
      }
      public GameObject Go{
          get{
              return go;
          }
          set{
              go=value;
          }
      }
             
 }
 
 public int i; //Array ordering int, needs reseting after each battle
 public Turns[] BattleTurns=new Turns[10];
 
 // Use this for initialization
 void Start () {
 
 }
 
 // Update is called once per frame
 void Update () {
 
 }
 
 public int GetPriority(int a,GameObject go){ 
     int priority;
     priority=a*100+a*100*((Random.Range(-20,20))/100); //Priority Setting function, needs testing
     SetPriority(priority,go);
     return priority;
 
 }
 
 public void SetPriority(int b,GameObject went){        
     BattleTurns[i].Priority=b;  <--line 51
     BattleTurns[i].Go=went;
     i++;
 
 }

}

When we try to run it, Unity gives the following error:

NullReferenceException: Object reference not set to an instance of an object TurnSystem.SetPriority (Int32 b, UnityEngine.GameObject went) (at Assets/Scripts/TurnSystem.cs:51) TurnSystem.GetPriority (Int32 a, UnityEngine.GameObject go) (at Assets/Scripts/TurnSystem.cs:45) Stats.OnSpawned () (at Assets/Scripts/Stats.cs:21)

I'm guessing something is wrong in the way we declare stuff on GetPriority but I can't find how to properly fix it...

Thanks in advance