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Question by banzai777 · Nov 21, 2014 at 05:08 AM · c#nullreferenceexception

[C#] Can't get variable from other script. Yields NullReferenceException

I have a script -- Player.cs -- on one game object and another script -- Land.cs -- on a different game object. Land.cs has a public string array named items. I Player.cs to access that array. Here's how I'm trying to do that:

 using UnityEngine;
 using System.Collections;
 
 public class Player : MonoBehaviour {
     private string[] items;
     private Transform brain;
 
     void Start () {
         brain = transform.Find("Brain");
         items = brain.GetComponent<Land>().items;
     }
 }

It throws a null reference exception on the "items = brain.GetComponent().items;" line. Here's Land.cs:

 using UnityEngine;
 using System.Collections;
 
 public class Land : MonoBehaviour {
     public string[] items = new string[8];
     void Start () {}
 }
 

I've added a couple test values to the script in the inspector. Both scripts are on active game objects. Any ideas?

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avatar image Uldeim · Nov 21, 2014 at 05:10 AM 0
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I'd start by using variations on Debug.Log("Brain is" + brain == null ? "NULL" : brain.ToString()); to narrow down the problem.

avatar image banzai777 · Nov 21, 2014 at 03:27 PM 0
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The same thing can be accomplished with this: Debug.Log(brain); It's null. So the problem is that it's not finding a transform that is sitting right there in the root of the heirarchy.

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Answer by banzai777 · Nov 21, 2014 at 03:54 PM

Should be GameObject.Find("Brain").transform

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