Can be useful to know if pyusb is not able to find any backend

Author: Sliim

jackit/lib/nrf24.py

@@ -69,7 +69,7 @@ def __init__(self, index=0):
         try:
             self.dongle = list(usb.core.find(idVendor=0x1915, idProduct=0x0102, find_all=True))[index]
             self.dongle.set_configuration()
-        except usb.core.USBError as ex:
+        except (usb.core.NoBackendError, usb.core.USBError) as ex:
             raise ex
         except:
             raise Exception('Cannot find USB dongle.')