Change material shader in game

I want to change material shader in game, like from tessellation shader to a simple diffuse shader, i use this material as my ground texture. Now, when i try to play my game in unity editor, shader changes correctly, but when i build a separate pc game, my texture change from tessellated to plain pink color. Piece of code :

Code (JavaScript):

1. /*In some function*/
2. if(Input.GetKeyDown(KeyCode.V)) {
3.     if(tessellation) {
4.       ChangeTextures("Bumped Diffuse");
5.       tessellation = false;
6.     }
7.     else {
8.       ChangeTextures("Tessellation/Bumped Specular (displacement)");
9.       tessellation = true;
10.     }
11.   }
12.  
13. function ChangeTextures(name : String) {
14.   var obj : GameObject[] = FindObjectsOfType(GameObject) as GameObject[];
15.   for(var a : GameObject in obj) {
16.     if(a.name == "Earth Plain") {
17.       a.GetComponent(MeshRenderer).material.shader = Shader.Find(name);
18.     }
19.   }
20. }

So, what is wrong, whats happening in my game ? Is it not able to change a shader properly, or maybe material textures gets reseted and i need to set textures again after changing shader ?

 

Never mind, managed to do it by creating global array of Material, then creating some materials, assigning materials to array through unity Inspector, and then just changing in code a.getblaah.material = matsArray .