After running a python code for usb device following error is occured

Traceback (most recent call last):
File "", line 6, in
dev = usb.core.find(idVendor=0x1d6b, idProduct=0x0001)
File "/usr/lib/python2.7/site-packages/usb/", line 1263, in find
raise NoBackendError('No backend available')
usb.core.NoBackendError: No backend available

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