Question One class does't see the field of another class

Code (CSharp):

1. public class SaveSystem : MonoBehaviour
2. {
3.     [SerializeField] private String lvlName;
4.     [SerializeField] private GameObject coin;
5.     public LvlState lvlState;
6.     [SerializeField] private Vector2[] conisPosition=new Vector2[3];
7.     private void Awake()
8.     {
9.       //  if (PlayerPrefs.HasKey(lvlName))
10.         {
11.             Debug.Log(lvlState.disableCoins.Length);
12.             lvlState = JsonUtility.FromJson<LvlState>(PlayerPrefs.GetString(lvlName));
13.             CoinsSpawn();
14.         }
15.     }
16.   public void CoinsSpawn()
17.     {
18.         for(int i = 0; i < 4; i++)
19.         {
20.             if (lvlState.disableCoins[i]==true) //NullReferenceException: Object reference not set to an instance of //an object
21. //SaveSystem.CoinsSpawn ()
22.             {
23.              
24.                 Instantiate(coin);
25.             }
26.         }
27.     }
28. }
29.  
30. [Serializable]
31. public class LvlState
32. {
33.    [SerializeField]public bool[] disableCoins = new bool[3];
34.  
35. }

 

Are we supposed to guess which class doesn't see which field?
Do you mean the null reference comment you're referring to in line 20 of the SaveSystem class?

 

Yep ,LvlState class, disableCoins field

 

Did you try to google the error message or debug the code?

 

Yes im trying , it prints the length of disableCoins, but if put in a condition it gives "null" . line 20

 

You print the length in line 11, but in line 12 you override the lvlState variable with the json value, maybe the json call returns null

 

1. Did you assign the LvlState reference in the SaveSystem's inspector? If yes...
2. Did you assign any values in the LvlState's inspector?

One other thing I'm noticing is that your for-loop will cause an IndexOutOfBoundeException. It will loop 4 times, but your array has only 3 values (assuming you didn't add any more in the inspector).
Instead of using a set number to loop by, use the length of the array:

for(int i = 0; i < lvlState.disableCoins.Length; i++)

 

Yes,you'r right.Big thanks