Locomotion System Edit leg controller

I recently downloaded the locomotion system tutorial, but I can't seem to make it work. When I add the Leg Controller to my Hero character, in the editor it says that:

 "Multi-object editing is not supported". 

One of the error Unity says is "`Instance of LocomotionEditorClass couldn't be created because there is no script with that name."`

LocomotionEditorClass is located in Assets/LocomotionSystem/Editor while LegController is located at Assets/LocomotionSystem.

I'd like to know what to do next so I can modify LegController in the editor to initialize it.

Thanks!