Error Shaders in Unity5

Shader "Enviro/BumpedDiffuseOverlaySM2" {

Properties {
_Color ("Main Color", Color) = (1,1,1,1)
_Opacity ("Color over opacity", Range (0, 1)) = 1
_MainTex ("Color over (RGBA)", 2D) = "white" {}
_BumpMap ("Normalmap over", 2D) = "bump" {}
_MainTex2 ("Color under (RGBA)", 2D) = "white" {}
_BumpMap2 ("Normalmap under", 2D) = "bump" {}
}

SubShader {
Tags { "RenderType"="Opaque" }
LOD 400

CGPROGRAM
#pragma surface surf Lambert
#pragma exclude_renderers flash

sampler2D _MainTex;
sampler2D _BumpMap;
sampler2D _MainTex2;
sampler2D _BumpMap2;
fixed4 _Color;
float _Opacity;

struct Input {
float2 uv_MainTex;
float2 uv_BumpMap;
float2 uv_MainTex2;
float2 uv_BumpMap2;
};

void surf (Input IN, inout SurfaceOutput o) {
float4 tex = tex2D(_MainTex, IN.uv_MainTex);
float4 tex2 = tex2D(_MainTex2, IN.uv_MainTex2);
float4 dest;
_Opacity*=tex.a;
dest.rgb = tex2.rgb<=0.5 ? 2*tex.rgb*tex2.rgb : 1-2*(1-tex.rgb)*(1-tex2.rgb);
dest.rgb = lerp(tex2.rgb, dest.rgb, _Opacity);
dest.rgb *= _Color.rgb;
o.Albedo = dest.rgb;
o.Alpha = tex2.a * _Color.a;

float4 norm = tex2D(_BumpMap, IN.uv_BumpMap);
float4 norm2 = tex2D(_BumpMap2, IN.uv_BumpMap2);
dest = norm2<=0.5 ? 2*norm*norm2 : 1-2*(1-norm)*(1-norm2);
dest = lerp(norm2, dest, _Opacity);
o.Normal = UnpackNormal(dest);
}
ENDCG

}

SubShader {
Tags { "RenderType"="Opaque" }
LOD 400

CGPROGRAM
#pragma surface surf Lambert
#pragma only_renderers flash

sampler2D _MainTex;
sampler2D _MainTex2;
fixed4 _Color;
float _Opacity;

struct Input {
float2 uv_MainTex;
float2 uv_MainTex2;
};

void surf (Input IN, inout SurfaceOutput o) {
float4 tex = tex2D(_MainTex, IN.uv_MainTex);
float4 tex2 = tex2D(_MainTex2, IN.uv_MainTex2);
float4 dest;
_Opacity*=tex.a;
dest.rgb = tex2.rgb<=0.5 ? 2*tex.rgb*tex2.rgb : 1-2*(1-tex.rgb)*(1-tex2.rgb);
dest.rgb = lerp(tex2.rgb, dest.rgb, _Opacity);
dest.rgb *= _Color.rgb;
o.Albedo = dest.rgb;
o.Alpha = tex2.a * _Color.a;
}
ENDCG

}

FallBack "Bumped Diffuse"
}

Anyone to help me fix this??