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Error when trying to setup connection to Maplin Arm
>>> s = MaplinRobot()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "maplinrobot.py", line 26, in __init__
self.rctl = usb.core.find(idVendor=self.usb_vendor_id, idProduct=self.usb_prod_id) #Object to talk to the robot
File "/Library/Python/2.7/site-packages/usb/core.py", line 1263, in find
raise NoBackendError('No backend available')
usb.core.NoBackendError: No backend available
# fix
$ brew install libusb-compat
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