"shader is not supported" error with hololens

Mathis

Unfortunately my shader is working on unity but not on the hololens.
This is for a really important project and I can't find the reason for this error.

Here is the code:

Shader "Custom/RenderDepth" 
 {
     Properties 
     {
         _MainTex("Base (RGB)", 2D) = "white" {}
         _DepthLevel("Depth Level", Range(0, 1)) = 1
     }
     SubShader 
     {
         Pass 
         {
             CGPROGRAM 

#pragma vertex vert 
#pragma fragment frag 
# include "UnityCG.cginc"


             uniform sampler2D _MainTex; 
uniform sampler2D _CameraDepthTexture; 
             uniform fixed _DepthLevel;
uniform half4 _MainTex_TexelSize; 

             struct input
{

    float4 pos : POSITION; 
                 half2 uv : TEXCOORD0; 
             };

struct output
{
    float4 pos : SV_POSITION; 
                 half2 uv : TEXCOORD0;
             };


output vert(input i)
{
    output o;
    o.pos = mul(UNITY_MATRIX_MVP, i.pos);
    o.uv = MultiplyUV(UNITY_MATRIX_TEXTURE0, i.uv);
#if UNITY_UV_STARTS_AT_TOP
                 if (_MainTex_TexelSize.y < 0) //Needs to be done because the 0 position is different in Direct3D-like and OpenGL-like
                         o.uv.y = 1 - o.uv.y;
#endif

    return o;
}

fixed4 frag(output o) : COLOR 
             {
                 float depth = UNITY_SAMPLE_DEPTH(tex2D(_CameraDepthTexture, o.uv)); 
depth = pow(Linear01Depth(depth), _DepthLevel); 
                 return depth;
             }


             ENDCG
         }
     }
 }

Do you have any ideas ? Any help is greatly appreciated.