Scripts working in Editor, but not in build

Questions & Answers
1

Everything works great in the editor, but as soon as I try it in the build, some of the controls don’t work, such as the Jump mechanic using the spacebar. It also gives me the following error: “NullReferenceException: Object reference not set to an instance of an object
Player.Update () (at Assets/Scripts/Player/Player.cs:44)”. Please help me! This project is due in less than a week!!

Here’s the script that tracks the player’s health and what not:

{
    public Collision2D collision;

    GameObject playerObject;
    Collider2D player;
    Rigidbody2D player_rb;
    readonly AudioSource gg_player;
    
    [Header("Enemy Hook Config")]
    public Rigidbody2D nearestEnemy;
    public Transform nearestEnemyTransform;

    [Header("Health Tracking")]
    public HealthBar healthBar;
    public Slider healthSlider;
    public int maxHealth = 100;
    public int currentHealth;

    private void Start()
    {
        healthSlider = GetComponent<Slider>();

        // Get the nearest enemy transform and collider
        nearestEnemyTransform = FindObjectOfType<EnemyAI>().GetComponent<Transform>();
        nearestEnemy = GetComponent<Rigidbody2D>();

        // Set player health data
        healthBar.SetMaxHealth(maxHealth);
        healthBar.SetHealth(currentHealth);
        currentHealth = maxHealth;
    }

    void Update()
    {
        if (collision.gameObject.CompareTag("Enemy"))
        {
            TakeDamage(10);
        }

        if (currentHealth <= 0)
        {
            KillPlayer();
        }
        else
        {
            return;
        }
    }

    void KillPlayer()
    {
        SceneManager.LoadScene("GameOver");
    }

    //public void OnCollisionEnter2D()
    //{
    //    if(collision.collider.gameObject.CompareTag("Enemy"))
    //    {
    //        TakeDamage(10);
    //    }
    //}

    void TakeDamage(int damage)
    {
        currentHealth -= damage;
        healthBar.SetHealth(currentHealth);
    }
}
2

Make Player public, like this.

public GameObject PlayerObject;

Then drag and drop the player into the slot with PlayerObject on it.

Alternatively, in Start, type:

PlayerObject = GameObject.Find("PlayerObject");

Edit: Change Player to player. In the update.

3

Hi
A bit late try:

OnCollisionEnter(collision.gameobject.CompareTag(“Enemy”))
{
TakeDamage(10);
}

not:

 void Update()
 {
     if (collision.gameObject.CompareTag("Enemy"))
     {
         TakeDamage(10);
     }