Xen users - Jul 2011 - Problem adding an usb device

I install an XP on xen, and it worked fine, but i want to add a usb
device in the machine. 
so i use the methods in 
http://www.virtuatopia.com/index.php..._domainU_Guest
while, first i wanted to use the dynamic method, which is the second
one, but it failed, because when i get into the machine, ctrl+alt+2
didn''t bring me to a console interface other than nothing.
so I tried the first one, while when i add the 

usbdevice=[''host:0781:5567'']

in the configuration file, and create the machine, and it told me that

sudo xm create xenwin.cfg
Using config file "./xenwin.cfg".
Error: ''list'' object has no attribute
''startswith''
why? i totally followed the steps. Hope that you know the answer and
thanks for telling me...or you can tell me how to use a usb in the
virtual machine.

here''s something that might be helpful:


lsusb
Bus 006 Device 001: ID 0000:0000  
Bus 003 Device 006: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Bus 003 Device 004: ID 062a:3633 Creative Labs 
Bus 003 Device 001: ID 0000:0000  
Bus 004 Device 001: ID 0000:0000  
Bus 005 Device 001: ID 0000:0000  
Bus 002 Device 002: ID 064e:a116 Suyin Corp. 
Bus 002 Device 001: ID 0000:0000  
Bus 001 Device 007: ID 0781:5567 SanDisk Corp. Cruszer Blade
Bus 001 Device 001: ID 0000:0000


here is my config file


import os, re
arch = os.uname()[4]
if re.search(''64'', arch):
    arch_libdir = ''lib64''
else:
    arch_libdir = ''lib''

kernel = "/usr/lib/xen/boot/hvmloader"

builder=''hvm''

memory = 512
shadow_memory = 8
name = "xenhvm"
vif = [ ''type=ioemu, bridge=xenbr0'' ]
disk = [ ''file:/home/deity/xenwin.img,hda,w'',
''file:/home/deity/Downloads/WinxpSP3.iso,hdc:cdrom,r'' ]
device_model = ''/usr/'' + arch_libdir +
''/xen/bin/qemu-dm''
# boot on floppy (a), hard disk (c) or CD-ROM (d) 
# default: hard disk, cd-rom, floppy
boot="cd"

#monitor=1
sdl=0
vnc=1
vncconsole=1
vncpasswd=''''
stdvga=0
serial=''pty''
usb=1
usbdevice=[ ''host:067b:2303'' ]




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mm, you must have something wrong on the other hand, I have a Windows 2003 with:
/ - win. cfg
usb = 1
usbdevice = ''host: 0925:01003''
\ - win. cfg

On the command line You can add the usb:
xm win usb-add host: 0925:01003

I use it for a usb hardkey and I walk 10.

Pobaste delete all USB devices from windows? (works for me with usb
mouse on windows host)

if you get error "Error: ''list'' object has no attribute
''startswith''"
in google it comes to Python syntax error, for me you should have
something misspelled in the archivo.cfg

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