Question I wanted to change the color of material applied on prefab through script when a button is pressed

Code (CSharp):

1. using UnityEngine;
2.  
3. public class Colorpicker : MonoBehaviour
4. {
5.  
6.     public MeshRenderer enderer;
7.     public Material green;
8.     public Material red;
9.     public Material blue;
10.     public Material _default;
11.     public Material orange;
12.  
13.  
14.     // Start is called before the first frame update
15.     void Start()
16.     {
17.         enderer =GetComponent<MeshRenderer> ();
18.  
19.  
20.     }
21.  
22.     public void DefaultColor()
23.     {
24.  
25.  
26.         enderer.sharedMaterial.color = _default.color;
27.  
28.  
29.     }
30.  
31.     public void BlueColor()
32.     {
33.  
34.         enderer.sharedMaterial.color = blue.color;
35.  
36.     }
37.  
38.     public void RedColor()
39.     {
40.  
41.         enderer.sharedMaterial.color = red.color;
42.  
43.     }
44.     public void GreenColor()
45.     {
46.  
47.         enderer.sharedMaterial.color = green.color;
48.  
49.     }
50.  
51.     public void OrangeColor()
52.     {
53.  
54.         enderer.sharedMaterial.color = orange.color;
55.  
56.     }
57.  
58. }
59.  

this script works fine in editor(without any error). when I build my project(for android) this script doesn't work.
It only changes the color of material and that's what I want.