a problem to run demo

[lindbergh153]

Hello, I ran the demo given in the documentation (plz see the enclosed code) but gave me the following error msg
ImportError: cannot import name 'viewer' from 'skimage' (D:\Miniconda3\envs\gnome\lib\site-packages\skimage_init_.py)

###################################################################################
"""3D surface plot example."""
import numpy as np
import matplotlib.cm

from Stoner import Data

x, y, z = np.meshgrid(
np.linspace(-2, 2, 21), np.linspace(-2, 2, 21), np.linspace(-2, 2, 21)
)
x = x.ravel()
y = y.ravel()
z = z.ravel()
u = np.sin(x * y * z)

p = Data(x, y, z, u, setas="xyzu", column_headers=["X", "Y", "Z"])

p.plot_voxels(cmap=matplotlib.cm.jet, visible=lambda x, y, z: x - y + z < 2.0)
p.title = "Voxel plot"