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usb.core.USBError on Beaglebone Black for USB Rocket Launcher

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http://stackoverflow.com – I am having problems controlling a USB Rocket Launcher from a Beaglebone Black running Debian. The Rocket Launcher I am using is shown here: http://www.thinkgeek.com/product/8a0f/ I am using nmilford's API in python to control this launcher: def turretUp(self, event): self.message1.set("Turret Up.") self.dev.ctrl_transfer(0x21,0x09,0,0,[0x02,0x02,0x00,0x00,0x00,0x00,0x00,0x00]) def turretDown(self, event): self.message1.set("Turret Down.") self.dev.ctrl_transfer(0x21,0x09,0,0,[0x02,0x01,0x00,0x00,0x00,0x00,0x00,0x00]) def turretLeft(self, event): self.message1.set("Turret Left.") (HowTos)