help with UI Manager Script for score and points system

Unity Engine
1

hi, I am having problems with my code can’t seem to get the score and points to work. there are no errors showing with my code, the score just won’t change on UI when I kill the enemies and there is no point given to the Player. so here I have posted all my code

Player Code

    [SerializeField]
    private float _speed = 3.5f;
    private float _speedMultiplier = 2;
    [SerializeField]
    private GameObject _LazerPrefab;
    [SerializeField]
    private GameObject _TripleShotPrefab;
    [SerializeField]
    private float _fireRate = 0.5f;
    private float _canFire = 1f;
    [SerializeField]
    private int _lives = 3;
    private SpawnManager _spawnManager;
    private UIManager _uiManager;
    [SerializeField]
    private bool _isTripleShotActive = false;
    [SerializeField]
    private bool _isSpeedBoostActive = false;
    private bool _isShieldsActive = false;
    [SerializeField]
    private GameObject _shieldVisualizer;
    [SerializeField]
    private int _score;



  


 

    // Start is called before the first frame update
    void Start()
    {
       
        transform.position = new Vector3(0, 0, 0);
        _spawnManager = GameObject.Find("Spawn_Manager").GetComponent<SpawnManager>();
        _uiManager = GameObject.Find("Canvas").GetComponent<UIManager>();
        if (_spawnManager == null)
        {
            Debug.LogError("the spawn manager is null");
        }

        if (_uiManager == null)
        {
            Debug.LogError("the UI Manager is NULL.");
        }
    }

    // Update is called once per frame
    void Update()
    {
        CalculateMovement();

if (Input.GetKeyDown(KeyCode.Space) && Time.time > _canFire)
        {
            FireLazer();
        }
          
    }

   void CalculateMovement()
    {
        float horizontalInput = Input.GetAxis("Horizontal");
        float VerticalInput = Input.GetAxis("Vertical");
        Vector3 direction = new Vector3(horizontalInput, VerticalInput, 0);
        transform.Translate(direction * _speed  * Time.deltaTime);
       
     
      

       
       transform.position = new Vector3(transform.position.x, Mathf.Clamp(transform.position.y, -3.8f, 0), 0);

        if (transform.position.x > 11.3f)
        {
            transform.position = new Vector3(-11.3f, transform.position.y, 0);
        }
        else if (transform.position.x < -11.3f)
        {
            transform.position = new Vector3(11.3f, transform.position.y, 0);
        }
    }


    void FireLazer()
    {
        _canFire = Time.time + _fireRate;

        if (_isTripleShotActive == true)
        {
            Instantiate(_TripleShotPrefab, transform.position, Quaternion.identity);
        }
        else
        Instantiate(_LazerPrefab, transform.position + new Vector3(0, 1.05f, 0), Quaternion.identity);
    }

    public void Damage()
    {
        if (_isShieldsActive == true)
        {
            _isShieldsActive = false;
            _shieldVisualizer.SetActive(false);
            return;
        }
  
        _lives -= 1;

        if(_lives < 1)
        {
            _spawnManager.OnPlayerDeath();
            Destroy(this.gameObject);
        }
    }

    public void TripleShotActive()
    {
        _isTripleShotActive = true;
        StartCoroutine(TripleShotPowerDownRoutine());
    }
    IEnumerator TripleShotPowerDownRoutine()
    {
        yield return new WaitForSeconds(5.0f);
        _isTripleShotActive = false;
    }
     public void SpeedBoostActive()
    {
        _isSpeedBoostActive = true;
        _speed *= _speedMultiplier;
        StartCoroutine(SpeedBoostPowerDownRoutine());
    }

    IEnumerator SpeedBoostPowerDownRoutine()
    {
        yield return new WaitForSeconds(5.0f);
        _isSpeedBoostActive = false;
        _speed /=_speedMultiplier;
    }
    public void ShieldActive()
    {
        _isShieldsActive = true;
        _shieldVisualizer.SetActive(true);
    }
    public void AddScore(int points)
    {
        _score += points;
        _uiManager.UpdateScore(_score);
    }
}

Enemy Code

public class Enemy : MonoBehaviour
{
    [SerializeField]
    private float _speed = 4.0f;

    private Player _player;

    // Start is called before the first frame update
    void Start()
    {
        _player = GameObject.Find("Player").GetComponent<Player>();
    }

    // Update is called once per frame
    void Update()
    {

        transform.Translate(Vector3.down * _speed * Time.deltaTime);

        if (transform.position.y < -5f)
        {
            float randomX = Random.Range(-8, 8f);
            transform.position = new Vector3(randomX, 7, 0);
        }

    }
    private void OnTriggerEnter2D(Collider2D other)
    {
        if (other.tag == "Player")
        {
            Player player = other.transform.GetComponent<Player>();
           
            if (player != null)
            {
                player.Damage();
            }

            Destroy(this.gameObject);
        }
        if (other.tag == "Lazer")
        {
            Destroy(other.gameObject);

            if (_player != null)
            {
                _player.AddScore(10);
            }

            Destroy(this.gameObject);
        }
    }
  
}

UI Manager Code

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

public class UIManager : MonoBehaviour
{
    [SerializeField]
    private Text _scoreText;
    // Start is called before the first frame update
    void Start()
    {
        _scoreText.text = "Score: " + 0;
    }
    public void UpdateScore(int playerScore)
    {
        _scoreText.text = "Score: " + playerScore;
    }
}

here is all the code that has the scoring system any help would great thank you

2

Probably your AddScrore method never gets called. This may happen if you forgot to reference proper player script instance in the enemy script instances.

3

hi thank you for replying but I don’t understand what you mean. here is the error form the unity console
NullReferenceException: Object reference not set to an instance of an object
Enemy.Start () (at Assets/Scripts/Enemy.cs:15)

sorry, I have learning disabilities and autism so I find it hard to understand.

4 
 _player = GameObject.Find("Player").GetComponent<Player>();

probably I was right. I suppose the object “Player” not found. In that case GameObject.Find returns null reference and your attempt to call GetComponent on null reference leads to null reference exception.

5

so if you don’t mind me asking what do I change, thank u