Rhino3dm: face get mesh always None!

Hello , what is the error in this code? always GetMesh(rh.MeshType.Any) is None.
The file is a simple cube

import rhino3dm as rh

file = "..../cube.3dm"
rf = rh.File3dm.Read(file)

for obj in rf.Objects:
        geo = obj.Geometry
        if geo.ObjectType == rh.ObjectType.Brep:
            faces = geo.Faces
            for i in range(len(faces)):
                print i, faces[i]
                mesh = faces[i].GetMesh(rh.MeshType.Any)
                print mesh

0 <rhino3dm._rhino3dm.BrepFace object at 0x00000000037E4650>
None
1 <rhino3dm._rhino3dm.BrepFace object at 0x00000000037E4650>
None
2 <rhino3dm._rhino3dm.BrepFace object at 0x00000000037E4650>
None
3 <rhino3dm._rhino3dm.BrepFace object at 0x00000000037E4650>
None
4 <rhino3dm._rhino3dm.BrepFace object at 0x00000000037E4650>
None
5 <rhino3dm._rhino3dm.BrepFace object at 0x00000000037E4650>
None

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