WuFOIL error

[Nhunsur]

I am a newbie for using wufoil and while executing the code snippets in the website I got this error message

File d:\aero_auto\cfd_hkn\geogen2_7\hkn_geo\wufoil-master\wufoil-master\untitled3.py:9
af = wf.airfoil('rae2822', chord_lenght=1, name='rae2822')

TypeError: 'module' object is not callable

Code used is copy pasted from site

import wuFoil as wf
af = wf.Airfoil('rae2822.dat', chord_length=1, name='airfoil')
af.plot_airfoil(show_plot=False) # don't show the plot yet. linestyles are set based on typical matplotlib syntax
af.interpolate_airfoil(n_points=100) # note that n_points sets the number of points on both the bottom and top surfaces
af.plot_airfoil(show_plot=True)
af.set_tc_camber()

print(f'Maximum Camber {af.max_camber} at location x/c = {af.x_mc}')
print(f'Maximum Thickness {af.max_thickness} at location x/c = {af.x_tc}')
af = wf.airfoil('rae2822')
af.set_flight_conditons(35000, .78, input_units='ft') # must be run before setting the y+ value
af.mesh_parameters.downstream_distance = 15
af.mesh_parameters.n_airfoil = 125
af.set_desired_yplus(1)
af.generate_mesh()

Thanks in advance
Narahari Hunsur