Null Reference Exception

Hello I am having problems with the following code:

Code (CSharp):

1.  
2.  
3. using System.Collections;
4. using System.Collections.Generic;
5. using UnityEngine;
6.  
7. public abstract class Node : MonoBehaviour {
8.  
9.  
10.         public Transform cameraPosition;
11.  
12.  
13.      void OnMouseDown()
14.             {
15.             Camera.main.transform.position = cameraPosition.transform.position;
16.              Camera.main.transform.rotation = cameraPosition.rotation;
17.         }
18. }
19.  
20.  

I get the error:

NullReferenceException: Object reference not set to an instance of an object

The error is for the line:

Camera.main.transform.position = cameraPosition.transform.position;


Can anyone help?

 

Is the field cameraPosition assigned in the inspector of editor?

 

Yes. I set it in the inspector.

 

I found an answer by searching Google. The problem was that Main Camera needed to have the Tag Main Camera. Thanks anyway.