ValueInterface Interface: namefield not recognized

Hiya all,

I'm trying to share a string type field between two components. In the host one, I first declare the local field as an interface type:

ValueInPlaceInterface<string> _Humanoid_heading = new ValueInPlaceInterface <string>("");

Then, once it is declared, I register it for other components to find:

protected override void _RegisterInterfaces(TorqueObject owner)
        {
            base._RegisterInterfaces(owner);
            Owner.RegisterCachedInterface("string","Humanoid_heading",this,_Humanoid_heading);
        }

Finally, in the client component, I input the following reference private field:

ValueInPlaceInterface <string> _Humanoid_heading;

So far so good. Then, as a final step, I connect the local field with the other component:

if (!base._OnRegister(owner) || !(owner is T2DSceneObject))
                return false;
            _sceneObject = owner as T2DSceneObject;
            Humanoid_heading = Owner.Components.GetInterface<ValueInterface<string>>("string", "Humanoid_heading");

My problem at this stage is that Humanoid_heading is not recognized as a valid shared field, so I cannot compile.

You guys have a suggestion on what I might be missing?

Thanks