Getting error about include directory when attempting to reference custom extension
I am getting an error that I am not finding much online about. When I attempt to use a magic reference for an extension that a plugin needs, I get the following error:
<a href=http://www.vincentlakatos.com/resources/images/screenshots/2019-04-06_Mature_Americancrocodile.png" alt="" />
[https://www.vincentlakatos.com/resources/images/screenshots/2019-04-06_Mature_Americancrocodile.png]

Incase the image is not loading (doesnt appear to be loading for me), the error I receive is:
Oxide.Ext.Rustic is reference by RusticJobManager plugin but is not loaded! An appropriate include file needs to be saved to plugins\include\Ext.Rustic.cs if this extension is not required.​


As you ccan see, the Rustic Extension is loading, but when it goes down to loading a plugin that requires it, results in that error and the plugin never loads. Can anyone suggest what possible fixes might be? Im not sure what type of include file its looking for at plugins\include\Ext.Rustic.cs.
How are you trying to reference it?
I was using both a magic reference and a using statement
// Reference: Oxide.Ext.Rustic

using Oxide.Ext.Rustic;
using System;
using System.Collections.Generic;
using System.Linq;

namespace Oxide.Plugins 
{
    ...
}​
What is the name of your extension internally? Also, what is the namespace in the extension (Oxide.Ext.Rustic?)