shader not working after build

The deadline for my college project is on my monday and I realize now, the camera fog shader I found isn't working at all after build. Why? It does work in the editor. I put the shader into a resource folder, also included in "Always include shaders"... even put it on a primitive, shader.find isn't used either, its a script on my camera, accessing the shader with public... i have no clues about shaders, how can I fix this?

Edit: shader = Resources.Load<Shader>("Prefabs/Materials/Shaders/Fog"); seems or would work but it turns everything into a white mess
Edit2: okay -.- because he or she didn't found the shader -.- used the wrong path but the shader still doesnt work after build
Edit3: I think there is something wrong with the shader? :/

Code (CSharp):

1. Shader "Hidden/Fog"
2. {
3.     Properties
4.     {
5.         _MainTex ("Texture", 2D) = "white" {}
6.     }
7.     SubShader
8.     {
9.         // No culling or depth
10.         Cull Off ZWrite Off ZTest Always
11.  
12.         Pass
13.         {
14.             CGPROGRAM
15.             #pragma vertex vert
16.             #pragma fragment frag
17.  
18.             #include "UnityCG.cginc"
19.          
20.             // vertex input: position, UV
21.             struct appdata {
22.                 float4 vertex : POSITION;
23.                 float2 uv : TEXCOORD0;
24.             };
25.  
26.             struct v2f {
27.                 float4 pos : SV_POSITION;
28.                 float2 uv : TEXCOORD0;
29.                 float3 viewVector : TEXCOORD1;
30.             };
31.          
32.             v2f vert (appdata v) {
33.                 v2f output;
34.                 output.pos = UnityObjectToClipPos(v.vertex);
35.                 output.uv = v.uv;
36.                 // Camera space matches OpenGL convention where cam forward is -z. In unity forward is positive z.
37.                 // (https://docs.unity3d.com/ScriptReference/Camera-cameraToWorldMatrix.html)
38.                 float3 viewVector = mul(unity_CameraInvProjection, float4(v.uv * 2 - 1, 0, -1));
39.                 output.viewVector = mul(unity_CameraToWorld, float4(viewVector,0));
40.                 return output;
41.             }
42.  
43.             sampler2D _MainTex;
44.             sampler2D _CameraDepthTexture;
45.             float4 params;
46.  
47.             float4 colA;
48.             float4 colB;
49.             float4 colC;
50.             float4 colD;
51.  
52.             float remap(float v, float minOld, float maxOld, float minNew, float maxNew) {
53.                 return minNew + (v-minOld) * (maxNew - minNew) / (maxOld-minOld);
54.             }
55.  
56.             fixed4 frag (v2f i) : SV_Target
57.             {
58.                  // Create ray
59.                 float3 rayPos = _WorldSpaceCameraPos;
60.                 float viewLength = length(i.viewVector);
61.                 float3 rayDir = i.viewVector / viewLength;
62.              
63.                 // Depth and cloud container intersection info:
64.                 float nonlin_depth = SAMPLE_DEPTH_TEXTURE(_CameraDepthTexture, i.uv);
65.                 float depth = LinearEyeDepth(nonlin_depth) * viewLength;
66.                 float t = saturate(exp(-(depth + params.y) * params.x*.01));
67.  
68.                 //return t;
69.                 float4 fogCol = lerp(colA, colB, rayDir.y * .5 + .5 - params.w);
70.              
71.                 fixed4 col = tex2D(_MainTex, i.uv);
72.                 return col * t + fogCol * (1-t);
73.             }
74.             ENDCG
75.         }
76.     }
77. }
78.