Shader Slider

So I am trying to add some sliders to have more control over my shaders for each different mesh. I'm adding them to the Toon/Lighted Shader so I can control the ramp sizes.

For some reason though, it's giving me an error saying that the variables do not exist. I put them there, so I'm not sure why it can't access them. I am using Toon/Lighted Outline as the actual Shader, but I know the lighting is affected from this one. Could someone tell me whats up?

 Shader "Toon/Lighted" {
     Properties {
         _Color ("Main Color", Color) = (0.5,0.5,0.5,1)
         _MainTex ("Base (RGB)", 2D) = "white" {}
         _Ramp ("Toon Ramp (RGB)", 2D) = "gray" {} 
         
         _LightSize ("Light Size", Range (0, 1)) = 0.75
         _MidSize ("Mid Size", Range (0, 1)) = 0.75
         _DarkSize ("Dark Size", Range (0, 1)) = 0.25
     }
 
     SubShader {
         Tags { "RenderType"="Opaque" }
         LOD 200
         
 CGPROGRAM
 #pragma surface surf ToonRamp
 
 sampler2D _Ramp;
 
 #pragma lighting ToonRamp exclude_path:prepass
 inline half4 LightingToonRamp (SurfaceOutput s, half3 lightDir, half atten)
 {
     #ifndef USING_DIRECTIONAL_LIGHT
     lightDir = normalize(lightDir);
     #endif
     
     half d = dot (s.Normal, lightDir)*_LightSize + _MidSize + _DarkSize;
     half3 ramp = tex2D (_Ramp, float2(d,d)).rgb;
     
     half4 c;
     c.rgb = s.Albedo * _LightColor0.rgb * ramp * (atten * 2);
     c.a = 0;
     return c;
 }