I am trying to do an interpolation with IDW and I get TypeError: cannot convert the series to

Question

idw.idw_interpolation(
    input_point_shapefile="C:/INFORMATICA APLICADA 22-23/Estaciones.shp",
    extent_shapefile="C:/INFORMATICA APLICADA 22-23/zonas_urbana_dmq.shp",
    column_name="SO2",
    power=2,
    search_radious=4,
    output_resolution=250)

I am trying to do an interpolation with IDW and I get TypeError: cannot convert the series to <class 'float'>.