[Python] Loft splines cadquery [closed]

I am trying to make a LOFT on the splines that I generate to have a smooth surface but I get the following error:

ValueError: Nothing to loft


The part of my code that is creating a conflict is the following:

for i in range(num_circulos):
z = i * separacion
coordenadas_circulo = generar_coordenadas_circulo(radio, profundidades)

spline = cq.Workplane("XY").spline(coordenadas_circulo).close()

spline = spline.translate((0, 0, z))

splines.append(spline)

todas_las_splines = cq.Workplane("XY")

for spline in splines:
todas_las_splines = todas_las_splines.add(spline)

lofted_object = todas_las_splines.loft()

show_object(lofted_object)


With the function coordenadas_circulo, I return x,y coordinates. Yes, all splines have the same points, they create circles with a small relief:

[1] [1]: https://i.sstatic.net/zO1Uyg15.png

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