[Pled]

I need to create a plane using a face.
However, when I try to activate the Base Face,
a message says that "Item is not Found".

Num = ag.m.ModelFaces().Count;
face = ag.m.ModelFaces(Num);
ff = ag.gui.CreatePlane();
ag.gui.Commit();
ff.PlaneType = ag.c.PlaneOnFace;
ag.PlaneSubtype = 1;
ag.b.Regen();
ag.listview.ActivateItem("Base Face");
ag.facePick;
agb.AddSelect(agc.TypeFace, face);
ag.listview.ItemValue = "Apply";

What name should I use instead of "Base Face"?