IOS : extension 'GL_EXT_frag_depth' is not supported

Hi Unity community. I export my project on Mac to deploy on IOS, but i'm facing a terrible issue. The game crashes, after splash screen, and in the log I have this error :

 -------- Shader compilation failed
 #version 100
 #extension GL_EXT_frag_depth : enable
 precision highp float;
 uniform sampler2D _MainTex;
 uniform highp sampler2D _DepthTex;
 uniform highp vec4 _Color;
 varying highp vec2 xlv_TEXCOORD0;
 void main ()
 {
   lowp vec4 tmpvar_1;
   tmpvar_1 = (texture2D (_MainTex, xlv_TEXCOORD0) * _Color);
   gl_FragDepthEXT = texture2D (_DepthTex, xlv_TEXCOORD0).x;
   gl_FragData[0] = tmpvar_1;
 }
 -------- failed compiling:
 fragment evaluation shader
 WARNING: 0:4: extension 'GL_EXT_frag_depth' is not supported
 ERROR: 0:14: Use of undeclared identifier 'gl_FragDepthEXT'
 
 Note: Creation of internal variant of shader 'Hidden/BlitCopyWithDepth' failed.
 WARNING: Shader Unsupported: 'Hidden/BlitCopyWithDepth' - Pass '' has no vertex shader
 WARNING: Shader Unsupported: 'Hidden/BlitCopyWithDepth' - Setting to default shader.
 WARNING: Shader Unsupported: 'Hidden/VR/BlitTexArraySlice' - Pass '' has no vertex shader
 WARNING: Shader Unsupported: 'Hidden/VR/BlitTexArraySlice' - Setting to default shader.
 Setting up 1 worker threads for Enlighten.
   Thread -> id: 700001b8a000 -> priority: 1 
 UnloadTime: 1.018084 ms
 dyld: lazy symbol binding failed: Symbol not found: _UnityAdsSetReadyCallback
   Referenced from: /Users/kosted/Library/Developer/CoreSimulator/Devices/18976395-88FA-4F72-83C2-AF7736AA173D/data/Containers/Bundle/Application/A55D0694-B554-4482-B0CA-E48EF45D134D/studio.app/studio
   Expected in: flat namespace
 
 dyld: Symbol not found: _UnityAdsSetReadyCallback
   Referenced from: /Users/kosted/Library/Developer/CoreSimulator/Devices/18976395-88FA-4F72-83C2-AF7736AA173D/data/Containers/Bundle/Application/A55D0694-B554-4482-B0CA-E48EF45D134D/studio.app/studio
   Expected in: flat namespace
 
 (lldb) 

I tried many solution by setting Depth normals into "no support" for example, but still have the same issue. How could I resolve it please ?