how to run test-classifier.py from direct camera stream

[andro-galexy]

I modifed the test_classfier.py to get live frames from camera and detect object from live camera stream, but am getting this error:
ValueError: The parameter image must be a 2-dimensional array
at this line 👍
fd = hog(im_window, orientations, pixels_per_cell, cells_per_block, visualize, normalize)

here the complete Traceback:

File "../object-detector/cam-classifier.py", line 81, in
fd = hog(im_window, orientations, pixels_per_cell, cells_per_block, visualize, normalize)
File "/usr/lib/python2.7/site-packages/skimage/feature/_hog.py", line 79, in hog
assert_nD(image, 2)
File "/usr/lib/python2.7/site-packages/skimage/_shared/utils.py", line 166, in assert_nD
raise ValueError(msg % (arg_name, '-or-'.join([str(n) for n in ndim])))
ValueError: The parameter image must be a 2-dimensional array

Thanks :)