opencv - skimage's rgb2gray in python: AttributeError: Nonetype object has no attribute ndim -

opencv - skimage's rgb2gray in python: AttributeError: Nonetype object has no attribute ndim -

i using code (with skimage version 0.10.0) far can remember without issues:

from scipy import misc import scipy.io sio skimage.color import rgb2gray img = cv2.imread(myfile) img = rgb2gray(img)

but i'm getting error:

traceback (most recent phone call last): file "c:\work_asaaki\code\generateproposals.py", line 48, in <module> img = rgb2gray(img) file "c:\anaconda\lib\site-packages\skimage\color\colorconv.py", line 635, in rgb2gray if rgb.ndim == 2: attributeerror: 'nonetype' object has no attribute 'ndim'

what problem perchance be? how can prepare able convert image grayscale?

given error message problem imread phone call fails, means imgis none.

reason why imread phone call fails path file wrong.

python opencv image-processing grayscale