Shader Error

Hey guys, I am getting an error on line 39 of my Shader, I can't understand why it's not working, because I have this on various other shaders and it works without error.

However, i don't see a problem in game, but this is obviously happening for a reason.

But here is the Error guys.

"INCORRECT NUMBER OF ARGUMENTS TO NUMERIC-TYPE CONSTRUCTOR AT LINE 39"

Here is my code on Line 39 half3 ramp = tex2D (_Ramp, float2(diff)).rgb;

Like I said this works fine on other shaders, but it's only this one shader, I don't understand.. All i did was copy paste it from my other shader to this one.

So I don't get why it's not working....

I'll just post the entire Lightiing Ramp as well so you can try an help me diagnose this problem I hope.

 inline half4 LightingRamp (MySurfaceOutput s, half3 lightDir, half3 viewDir, half atten)
         {
           half3 h = normalize (lightDir + viewDir);
           
           half diff = max (0, dot (s.Normal, lightDir));
          
           float nh = max (0, dot (s.Normal, h));
           float spec = pow (nh, 32.0);
           half3 specCol = spec * s.GlossColor;
          
           half3 ramp = tex2D (_Ramp, float2(diff)).rgb;    // **LINE 39**
          
           half4 c;
           c.rgb = (s.Albedo * _LightColor0.rgb * diff * ramp + _LightColor0.rgb * specCol) * (atten * 2);
           c.a = s.Alpha;
           return c;
         }