Shader breaks on device.

Hello! I've been trying to make a simple gaussian blur shader using Grabpass.

I've managed to get it to work in the editor. The problem right now is that it doesn't display on Note 3 with Android 6.0. It gives me 'broken shader' pink instead.

What I do is run 4 of these passes:

 GrabPass{}
     
 Pass
 {
     CGPROGRAM
     #pragma target 2.0
     #pragma vertex vert
     #pragma fragment frag1
     ENDCG
 }

And the pass contains the following things :

 float4 frag3 (v2f i) : COLOR
 {
     pixel_info pinfo;
     pinfo.tex = _GrabTexture;
     pinfo.uv = UNITY_PROJ_COORD(i.proj);        
     pinfo.texelSize = _GrabTexture_TexelSize;
     return GaussianBlur(pinfo, _Resolution * 1.2, _Direction.zw);
 }

This works without issue in the editor, however once i compile it and run the project on mobile it no longer works.

The only error i have managed to get out of it is the following, occurring after the build finishes :

 Shader error in 'Custom/GaussianBlur': 'assign' :  cannot convert from 'uniform sampler2D' to 'sampler2D' at line 94 (on gles)

 Compiling Vertex program
 Platform defines: UNITY_NO_DXT5nm UNITY_NO_RGBM UNITY_NO_SCREENSPACE_SHADOWS UNITY_NO_LINEAR_COLORSPACE

Where line 94 is the

 pinfo.uv = UNITY_PROJ_COORD(i.proj);        

line, where no actual textures are being assigned. This is also very weird since the _GrabTexture property is not uniform.

Has anyone run into anything like this in the past? Any Suggestions?