Changing materials doesn't work when I build the game

Unity Engine
1

I have a scene named “Shop” in that scene I have a script that changes the material of my “Player” prefab via buttons OnClick event. Everything works fine. BUT when I build the game everything in the OnClick event works EXCEPT that it doesn’t change the material :frowning:

Here is the script:

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

public class ChangeMaterials : MonoBehaviour
{
    public bool isOwnedRed = false;
    public bool isOwnedBlue = false;

    public Text screenMessage;

    public Material[] materials;

    public Player playerScript;
    public GameObject player;
  public MeshRenderer playerRenderer;
  
    void Start()
    {
        playerRenderer = player.GetComponent<MeshRenderer>();
    }

    public IEnumerator ScreenMessage ()
    {
        screenMessage.enabled = true;
        yield return new WaitForSeconds(1.5f);
        screenMessage.enabled = false;
    }

    public void DefaultWhite()
    {
            screenMessage.text = "Material changed";
            playerRenderer.sharedMaterial = materials[0];
            StartCoroutine(ScreenMessage());
    }
    public void Red()
    {
        float cost = 15f;

        if (playerScript.coins >= cost && isOwnedRed == false)
        {
            Debug.Log("color RED ");
            playerRenderer.sharedMaterial = materials[1];
            playerScript.coins -= cost;
            playerScript.Save();
            playerScript.Load();
            screenMessage.text = "You bought RED material for 15 coins!";
            StartCoroutine(ScreenMessage());
            isOwnedRed = true;
        }
      
       else if(isOwnedRed == true)
        {
           screenMessage.text = "Material changed";
            playerRenderer.sharedMaterial = materials[1];
            StartCoroutine(ScreenMessage());
        }
         else
        {
            screenMessage.text = ("NOT ENOUGH COINS");
            StartCoroutine(ScreenMessage());
        }
     
    }

    public void Blue()
    {
        float cost = 15f;

        if (playerScript.coins >= cost && isOwnedBlue == false)
        {
        
            playerRenderer.sharedMaterial = materials[2];
            playerScript.coins -= cost;
            playerScript.Save();
            playerScript.Load();
            screenMessage.text = "You bought BLUE material for 15 coins!";
            StartCoroutine(ScreenMessage());
            isOwnedBlue = true;
        }

        else if (isOwnedBlue == true)
        {
            screenMessage.text = "Material changed";
            playerRenderer.sharedMaterial = materials[2];
            StartCoroutine(ScreenMessage());
        }
        else
        {
            StartCoroutine(ScreenMessage());
            screenMessage.text = ("NOT ENOUGH COINS");
        }
       
    }
}
2

Does it work if you use playerRenderer.material instead of playerRenderer.sharedMaterial?

3

I use sharedMaterial because only this works on a prefab.