[Part 15] NullReferenceException: Object reference not set to an instance of an

[Isaac]

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At

<code>protected virtual float GetSpawnAngle()     //Get the direction of the projectile should face when spawning
{
    return Mathf.Atan2(movement.lastMovedVector.y, movement.lastMovedVector.x) * Mathf.Rad2Deg;
}</code>

I found the same topic and I already checked the owner by using Debug.Log($”Owner: {owner.name}”); at Weapon:Item It shows ” owner: Player ” and I already assigned the weaponPrefab as a projectile into a WeaponData. Inside the weaponPrefab, I have added Projectile.cs too. What did I miss 🧐

[Isaac]

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<code>protected virtual float GetSpawnAngle() //Get the direction of the projectile should face when spawning
{
return Mathf.Atan2(movement.lastMovedVector.y, movement.lastMovedVector.x) * Mathf.Rad2Deg;
}</code>

[Terence]

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Can you share your NullReferenceException error message?

[Isaac]

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NullReferenceException: Object reference not set to an instance of an object. Projectile.GetSpawnAngle

[Terence]

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Can you share the entire piece of code that contains your NullReferenceException?

[Isaac]

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Here from this line. When the game starts there is no weaponPrefab spawn. I don’t know why it happens I have added the weaponPrefab in the weaponData

<code>protected virtual float GetSpawnAngle() //Get the direction the projectile should face when spawning
{
return Mathf.Atan2(movement.lastMovedVector.y, movement.lastMovedVector.x) * Mathf.Rad2Deg;
}</code>

[Isaac]

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I have checked and added the new code.

At ProjectileWeapon.cs I add this new line into the script

<code>public override void Start()
    {

        if (movement == null)
        {
            Debug.LogWarning("Movement is not assigned or cannot be found.");
        }
    }</code>

At GetSpwanAngle() I added this debug to check player movement by using this line

<code>protected virtual float GetSpawnAngle()     //Get direction the projectile should face when spawning
    {
        if (movement == null)
        {
            Debug.LogWarning("Movement is null. Cannot calculate spawn angle.");
            return 0f;
        }

        return Mathf.Atan2(movement.lastMovedVector.y, movement.lastMovedVector.x) * Mathf.Rad2Deg;
    }</code>

And yes. when I press start, it shows all the LogWarning I have added. It must be an issue with the PlayerController.cs for sure.

[Isaac]

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Here is my PlayerController.Cs I am using the NewInputSystem to control player movement. I think the problem lies in the NewInputSystem. Should I revert to using the original script?

<code>using UnityEngine;
using UnityEngine.InputSystem;
public class PlayerController : MonoBehaviour
{
    public static PlayerController instance;

    [HideInInspector]
    public Vector2 moveDir;                 //Move Directory
    [HideInInspector]
    public Vector2 lastMovedVector;
    [HideInInspector]
    public float lastHorizontalVector;      //Check last HorizontalVector
    [HideInInspector]
    public float lastVerticalVector;        //Check last VerticalVector

    Animator anim;
    SpriteRenderer spriteRenderer;
    Rigidbody2D rb;
    PlayerStats playerStat;



    void Awake()
    {
        playerStat = GetComponent<PlayerStats>();
        rb = GetComponent<Rigidbody2D>();
        anim = GetComponent<Animator>();
        spriteRenderer = GetComponent<SpriteRenderer>();
        if (instance == null)
        {
            instance = this;
        }
        else
        {
            Debug.LogWarning("EXTRA" + this + "DELETE");
            Destroy(gameObject);
        }
        lastMovedVector = new Vector2(1, 0f);      //at start of game the projectile weapon will have momentum
    }


    void Update()
    {
        InputManagement();
        if (moveDir.x != 0 || moveDir.y != 0)
        {
            anim.SetBool("Move", true);
            SpriteDirectionCheck();

        }
        else
        {
            anim.SetBool("Move", false);

        }


    }


    void FixedUpdate()
    {
        rb.velocity = new Vector2(moveDir.x * playerStat.MoveSpeed, moveDir.y * playerStat.MoveSpeed);
    }

    private void InputManagement()
    {

        //moveDir = new Vector2(Input.GetAxis("Horizontal"), Input.GetAxis("Vertical")).normalized;

        if (moveDir.x != 0)
        {

            lastHorizontalVector = moveDir.x;
            lastMovedVector = new Vector2(lastHorizontalVector, 0f);
        }
        if (moveDir.y != 0)
        {

            lastVerticalVector = moveDir.y;
            lastMovedVector = new Vector2(0f, lastVerticalVector);
        }
        if (moveDir.x == 0 && moveDir.y == 0)
        {


            lastMovedVector = new Vector2(lastHorizontalVector, lastVerticalVector);

        }



    }

    public void Move(InputAction.CallbackContext context)
    {
        moveDir = context.ReadValue<Vector2>().normalized;

    }

    void SpriteDirectionCheck()
    {
        // x < 0 = left // flip
        if (lastHorizontalVector < 0)
        {
            spriteRenderer.flipX = true;
        }
        else
        {
            spriteRenderer.flipX = false;
        }

    }

}</code>

[Terence]

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The issue is very likely that the movement variable is empty in ProjectileWeapon. That is what is causing the NullReferenceException.

How is your movement variable set in ProjectileWeapon? Are you still using the PlayerMovement component on ProjectileWeapon?

You can check out this 1-minute video to understand null reference exceptions better as well.

[Isaac]

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I have fixed it. Ty guy <3

[Terence]

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Fantastic. Do you mind sharing more about what was the issue?

[Author]

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