Yesterday the VNA example worked. Today I get the error:
C:\Users…\Documents\LimeVNA\pyLMS7002M-master\examples\VNA>python measureVNA.py r50
Searching for LimeSDR… Traceback (most recent call last):
File “measureVNA.py”, line 145, in
limeSDR = LimeSDR()
File “build\bdist.win-amd64\egg\pyLMS7002M\LimeSDR.py”, line 49, in init
File “build\bdist.win-amd64\egg\pyLMS7002M\LimeSDR.py”, line 146, in findLMS7002
File “build\bdist.win-amd64\egg\pyLMS7002M\boardUSB.py”, line 24, in findLMS7002
File “c:\python27\lib\site-packages\usb\core.py”, line 846, in find
raise ValueError(‘No backend available’)
ValueError: No backend available
Q: What is a backend? Does this mean No USB driver?
I get the same error if I unplug the LimeSDR USB cable.
In attempt to fix the problem I tried to install:
C:\Users…\Documents\LimeVNA\pyLMS7002M-master\cyLimeLib\win>python setup.py install
Traceback (most recent call last):
File “setup.py”, line 16, in
from Cython.Distutils import build_ext
ImportError: No module named Cython.Distutils
Yesterday it worked fine, today I get the above errors; why?
Also I know nothing about python. However; it seems similar to Pascal and the type casting seems to work the same.
Any help is appreciated.