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Question by unity_VVCR_fAIpvMG_Q · Jun 24, 2019 at 06:15 AM · c#nullreferenceexceptionvariablesmethodreturn

Variables are assigned but it returns null

I can't figure out what's the error in my code. I call the function Load from the Game Manager, but it returns null even if the variables are assigned in the inspector.

part of Game Manager:

 GameObject [] test = DeathLoad.instance.Load()
 print(test); //it returns null


Here's my death load script, which is called from the Game Manager.

DeathLoad:

 public class DeathLoad : MonoBehaviour{
 public static DeathLoad instance;
 //Screens are assigned in the inspector
 public GameObject [] screens;
 void Awake()
 {
     if(instance == null) instance = this;
 }
 
 public GameObject[] Load()
 {
     return screens;
 }
 
 }


I tried to call the method inside the DeathLoad and it works, but I need to call It from the Game Manager.

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avatar image Namey5 · Jun 24, 2019 at 06:31 AM 0
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Your Load method is setup to return an array of GameObjects, but your 'screens' variable is a single GameObject. I would imagine that type mismatch is causing the problem.

avatar image wolfulus Namey5 · Jun 24, 2019 at 06:53 AM 0
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In this case it wouldn't even compile tbh

avatar image unity_VVCR_fAIpvMG_Q Namey5 · Jun 24, 2019 at 07:18 AM 0
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No I made I mistake in copying code, that's not my issue :/

avatar image Namey5 unity_VVCR_fAIpvMG_Q · Jun 24, 2019 at 09:26 AM 0
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Are you certain your DeathLoad instance is actually being assigned before accessing its members?

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Answer by Bunny83 · Jun 24, 2019 at 09:42 AM

Assuming that you don't get any runtime error in the code you're providing, the only reason this could happen is that you have two instances of your "DeathLoad" class.


Try this in your Awake method

 void Awake()
 {
     Debug.Log("DeathLoad::Awake", this);
     if(instance == null)
         instance = this;
     else
         Debug.Log("Error instance is not null", instance);
 }

If you see more than two of these logs there's something wrong in your setup. When you click on the debug log message, Unity will highlight the context object so you can find the instance that you've stored in your singleton variable.


Note that if you do get runtime errors you have to provide your actual code and tell us exactly what error you get and in which line.

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Answer by Htss_samy · Jun 24, 2019 at 10:39 AM

first get 'DeathLoad' class from you gameobject (which gameobject have attach this script). then call your Load() function. ex: GameObject ClassObject = Gameobject.Find("---Your gameObject---"); var DeathLoadclass = ClassObject .getcomponet(); DeathLoadclass .Load();

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