WebGL + Substance runtime generation

So, needs some advice about: "How to make workable generated substance with WebGl build". For makes it clear - substance is a part of gameplay, so, i'm really need it in WebGl works nicely, correctly and as fast as it can be. Gets error at building progress:

"error CS0234: The type or namespace name ProceduralMaterial' does not exist in the namespaceUnityEngine'. Are you missing an assembly reference?"

So, if i'm do wrong - show the way, if there any trick or etc - show me the way to dig it in.