Null Reference Exception because of an object of a class

Unity Engine
1

Hello everybody,

So, I was making a game where the player must roll a ball on a platform and if they were to fall, they would get a “Press R to try again” message. After pressing R, the level would restart. However, when I press R, I get a Null Reference Exception:
“NullReferenceException: Object reference not set to an instance of an object
PlayerController.LateUpdate () (at Assets/Scripts/PlayerController.cs:39)”

I double checked every line of code and I cannot find the problem. At the line of code where I get an exception, Im using an object of a class to access one of its functions, the object was already initialised. Would you help me pinpoint the error? Thank you in advance.
Here’s the code:

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

public class PlayerController : MonoBehaviour {

    private float verticalMov;
    private float horizontalMov;
    public float speed = 250, jumpSpeed = 15.0f, gravity = 10;
    public int score;
    public Text scoreText, winText, tryAgainText;

    private Vector3 movement;
    private Rigidbody rb;
    public LoadNewLevel loadNewLevel;



    void Start () {
        rb = GetComponent<Rigidbody>();
        score = 0;
   }
  
   void LateUpdate () {

        horizontalMov = Input.GetAxis("Horizontal");
        verticalMov = Input.GetAxis("Vertical");

        movement = new Vector3(horizontalMov, 0.0f, verticalMov);

        if (Input.GetButtonDown("Jump"))
        {
              //jumpSpeed = 5.0f;
            movement.y = jumpSpeed;
        }

        rb.AddForce(movement * speed * Time.deltaTime);
                  
        if (transform.position.y < -10)
        {
            tryAgainText.text = ("Press R to try again");
        }

        if (Input.GetKeyDown(KeyCode.R) && transform.position.y < -10)
        {
            loadNewLevel.LoadNextLevel();
        }

        if (jumpSpeed > 0)
        {
            jumpSpeed -= gravity * Time.deltaTime;
        }
      
    }

    private void OnTriggerEnter(Collider other)
    {
        if (other.gameObject.CompareTag("Coins"))
        {
            other.gameObject.SetActive(false);
            score++;
            scoreText.text = "Score: " + score.ToString();
        }

        if (score > 4)
        {
            winText.text = ("YOU WIN!");
        }
    }
}






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

public class LoadNewLevel : MonoBehaviour {

   public void LoadNextLevel() {
        SceneManager.LoadScene(SceneManager.GetActiveScene().name);
   }
}
2

Where is your rb initialisation?

3 
.   
.
    private Rigidbody rb;
    public LoadNewLevel loadNewLevel;



    void Start () {
        rb = GetComponent<Rigidbody>();
        score = 0;
   }
.
.
4

Since you didn’t post your entire script, it’s hard to match up line numbers. Which line is giving you the null error?

5

I updated the code to include everything. It’s line 48.

6

So line 39 is rb.AddForce

Is your PlayerController script on the same object that has a rigidbody?

If yes, make sure you don’t have another copy of the PlayerController script in your scene.

7

There is only one Player Controller script attached to the Player, the one with the rigidbody. There are no empty fields in the Player Controller script in Unity.

8

right before your rb.addforce do

if(rb == null)
   Debug.Log("RB is null", gameObject);

If that prints out, click on it and see if it’s highlighting the proper gameobject.