Acces monobehaviour script from editor script

If your script is within a namespace, you need to include that namespace in your editor class in a using statement. Otherwise the IDE won't recognize it. As well, if you are trying to access monobehaviours, be sure to include the using UnityEngine; namespace. By default if you create a script in Editor it will assign a namespace based on the folder, like namespace Assets.Scripts which is easily changeable, but you won't be able to reference classes inside a namespace without using the namespace.

If you're using Visual Studios, it will show you the hierarchy on the right hand side, there is one tricky thing to be aware of. If your scripts are in the Plugins Hierarchy, then they themselves will not have access to NON-plugins, but all NON-plugins can access the Plugins. Moving a script from Plugins, Editor, or the main project, you can just grab it from the hierarchy and drag and drop it into the hierarchy you want it in. Keep in mind, this will not change the namespace, and occasionally has the effect of duplicating a class file.