NameSpace reference failure

I have tried many and many ways to create a nice planet mesh type, but without success for days. I came across multiple ideas; changing a cube to a sphere with subdivision and normalization, but i couldn't find suitable script examples; i tried to make my own, it failed when i faced the triangle generation from the vertices; i found a nice one that had the best "quality" and "potential", but it ended in a big fail; the poles were all messed up due to the triangles meeting there.

Well, i searched a bit more and i found this question with wonderful codes that seems good enough to try out. http://answers.unity3d.com/questions/455895/subdivision-and-normalization-of-mesh-vertices-des.html

but i have a big problem; error CS0246: The type or namespace name `RidgedMultifractal' could not be found. Are you missing a using directive or an assembly reference?

private RidgedMultifractal noise; //that is where the error is.

I am not missing the LibNoise, it is there, and it works, but i can't seem to use RidgedMultifractal, as they claim i am missing the ref.

this here is the header that differs just a little bit from the original question.

 using System;
 using System.Collections.Generic;
 using UnityEngine;
 using LibNoise.Unity;
 using LibNoise.Unity.Generator;
 using LibNoise.Unity.Operator;

i tried moving them around, and everything i could, so i guessed i should ask for help here.

(the script i am referring to is the second script of the page, which hasn't been altered yet)