Starting with Shaders

I suposse this is a very easy question, but drives me crazy,

In the first tutorial, Tutorial: ShaderLab and fixed function shaders - Unity Manual , it is supossed that , that code, turns pink an object.
Shader “Tutorial/Basic” {
Properties {
_Color (“Main Color”, Color) = (1,0.5,0.5,1)
}
SubShader {
Pass {
Material {
Diffuse [_Color]
}
Lighting On
}
}
}

But in fact does not. I do all that the tutorial said. But the material, is always grey.

What i am doing wrong?

You have to assign a material with that shader selected on the object you wish to use the shader. Once that is done you will see what the shader creates.

I did and I also hit PLAY