Why is Update not working (NullReferenceException)

Question

in my unity game I'm creating a Menu and and I want to move the camera with the player, when the game is started and I want to move the camera in the right position before (Vector3(1, 1, -1)). The problem is that I am using a Button connected with a script setting a public bool variable. But whatever I do, the NullReferenceException Error appears.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

    public class StartPosition : MonoBehaviour
    {
    
    public bool cameraFollow;



    public void TakeStartPosition()
    {
        transform.position = new Vector3(1, 1, -1);
        cameraFollow = true;

    }
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

    public class CameraFollow : MonoBehaviour
    {
    public Transform playerTransform;
    
    
    public StartPosition followOn;    
    private Vector3 cameraOffset;
    

    [Range(0.01f, 1.0f)]
    public float smoothFactor = 0.5f;


    // Start is called before the first frame update
    void Start()
    {       

        if (followOn.cameraFollow)
        {
            cameraOffset = transform.position - playerTransform.position;
            Debug.Log("It must work!!!");
        }
    
    }

    // Update is called once per frame
    private void LateUpdate()
    {
        if (followOn.cameraFollow)
        {
            Vector3 newPos = playerTransform.position + cameraOffset;
            newPos.z = transform.position.z;
            transform.position = Vector3.Slerp(transform.position, newPos, smoothFactor);

        }
        
    }
}

Well the value of the variable is `null` and therefore it will cause a `NullReferenceException`. What variable is `null` and on which line? — JohannesAndersson, Nov 27 '20 at 20:19

score 0 · Answer 1 · answered Nov 27 '20 at 20:20

This type of error appear when you didn't assign the value to a variable. In this case, i suppose that playerTransform is null. You can check this watching the public (or serialized) variables in the inspector clicking the gameObject you assigned this script to.

Why is Update not working (NullReferenceException)

1 Answers1