Unexpected error: <class 'xen.util.vusb_util.UsbDeviceParseError'>

["Jānis Andersons | Failiem.lv" <ja@failiem.lv>]

xen_major              : 4
xen_minor              : 4
xen_extra              : .3-3.el6
CentOS release 6.7 (Final)

After:
xm usb-hc-create demo_win2012_r2 2 4
xm usb-list demo_win2012_r2
WARNING: xend/xm is deprecated.
Idx BE  state usb-ver  BE-path
0   0   1     USB2.0  /local/domain/0/backend/vusb/2/0
port 1:
port 2:
port 3:
port 4:
xm usb-list-assignable-devices
WARNING: xend/xm is deprecated.
1-1          : ID 090c:1000 SMI Corporation USB DISK
1-10         : ID 14dd:0002 Peppercon AG Multidevice


xm usb-attach demo_win2012_r2 0 1 1-1

WARNING: xend/xm is deprecated.
Unexpected error: <class 'xen.util.vusb_util.UsbDeviceParseError'>

Please report to xen-devel@lists.xen.org
Traceback (most recent call last):
   File "/usr/sbin/xm", line 20, in <module>
     main.main(sys.argv)
   File "/usr/lib64/python2.6/site-packages/xen/xm/main.py", line 3946, 
in main
     _, rc = _run_cmd(cmd, cmd_name, args)
   File "/usr/lib64/python2.6/site-packages/xen/xm/main.py", line 3970, 
in _run_cmd
     return True, cmd(args)
   File "/usr/lib64/python2.6/site-packages/xen/xm/main.py", line 3011, 
in xm_usb_attach
     if vusb_util.bus_is_assigned(bus):
   File "/usr/lib64/python2.6/site-packages/xen/util/vusb_util.py", line 
275, in bus_is_assigned
     raise UsbDeviceParseError("Can't get assignment status: (%s)." % bus)
xen.util.vusb_util.UsbDeviceParseError: vusb: Error parsing USB device 
info: Can't get assignment status: (1-1).