def METHOD_NAME():
    mg = RasterModelGrid((5, 5))
    mg.add_zeros("topographic__elevation", at="node", dtype=float)
    _ = FlowAccumulator(mg)
    with pytest.raises(ValueError):
        LakeMapperBarnes(
            mg,
            method="Steepest",
            redirect_flow_steepest_descent=False,
            reaccumulate_flow=True,
        )