Pytrack "dfu-util: Cannot set alt interface zero"

[rene.garcia]

Hi,

Im having an issue when i try to update pytrack's firmare with dfu-util

renegarcia$ dfu-util -D /Users/renegarcia/Downloads/pytrack_0.0.8.dfu 
dfu-util 0.9

Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
Copyright 2010-2016 Tormod Volden and Stefan Schmidt
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to http://sourceforge.net/p/dfu-util/tickets/

Match vendor ID from file: 04d8
Match product ID from file: f014
Opening DFU capable USB device...
ID 04d8:f014
Run-time device DFU version 0100
Claiming USB DFU Runtime Interface...
dfu-util: Cannot set alt interface zero

Could you help me, please?