Shader on MacOs and Window - D3D shader assembly failed with: (15): error X5204:

I wrote shader that draw circle.

 Shader "CrossSircleShader2" {
 Properties {
     _Color ("Main Color", Color) = (1,1,1,1)
     _MainTex ("Base (RGB) Trans (A)", 2D) = "white" {}
     _Radius("Radius", Range(0,1)) = 0.5
     _Thickness("Thickness", Range(0, 0.1)) = 0.05
 }
 
 SubShader {
     Tags{"Queue" = "Transparent"}
     Pass {
         Blend One One
         ZWrite off
           
         CGPROGRAM
         #pragma vertex vert
         #pragma fragment frag
         
         #include "UnityCG.cginc"
         
         float4 _Color;
         float4 _CrossColor;
         float _Radius;
         float _Thickness;
         sampler2D _MainTex;
         
         struct v2f {
             float4  pos : SV_POSITION;
             float2  uv : TEXCOORD0;
             float2 uniformUV : TEXCOORD1;
             float4 color : COLOR;
             float2 normal : TEXCOORD2;
         };
         
         float4 _MainTex_ST;
         
         float Intersect(float4 circle, float2 uv) 
         {
             if (length(uv - circle.xy) < circle.z) 
             {
                 return 1;
             }
             
             return 0;
         }
         
         v2f vert (appdata_full v)
         {
             v2f o;
             o.pos = mul (UNITY_MATRIX_MVP, v.vertex);
             o.uv = TRANSFORM_TEX (v.texcoord, _MainTex);
             o.uniformUV = v.texcoord;
             o.normal = float2(1,1);
             return o;
         }
         
         half4 frag (v2f i) : COLOR
         {
             //float3 worldNormal = cross(ddy(i.pos.xyz), ddx(i.pos.xyz));
             //worldNormal = normalize(worldNormal);
             
             float4 maintex = tex2D(_MainTex, i.uv);
             float2 uv = i.uniformUV;
             uv -= float2(0.5, 0.5);
               
               float l = length(uv);
             
             if (l > _Radius) 
                 return maintex * 0;    
                     
            return maintex * maintex.a;
         }
         ENDCG
 
     }
 }
 
 Fallback "Transparent/VertexLit"
 }




 Shader error in 'CrossSircleShader2': D3D shader assembly failed with: (14): error X5204: Read of uninitialized components(*) in r1: *r/x/0 *g/y/1 *b/z/2 *a/w/3
 Shader Assembly: ps_2_0
 ; 11 ALU, 1 TEX
 dcl_2d s0
 def c1, -0.50000000, 1.00000000, 0.00000000, 0
 dcl t0.xy
 dcl t1.xy
 texld r2, t0, s0
 add r0.xy, t1, c1.x
 mul r0.xy, r0, r0
 add r0.x, r0, r0.y
 rsq r0.x, r0.x
 rcp r0.x, r0.x
 add r0.x, r0, -c0
 cmp_pp r1, -r0.x, r1, c1.z
 mul r2, r2, r2.w
 cmp_pp r0.x, -r0, c1.y, c1.z
 cmp_pp r0, -r0.x, r1, r2
 mov_pp oC0, r0

What wrong?