Description of problem:
I also don't know it is how to happen, but when I start the OS, it Pop-up message to remind me.

Version-Release number of selected component:
liveusb-creator-3.11.7-2.fc18

Additional info:
cmdline:        /usr/bin/python -tt /usr/sbin/liveusb-creator
dso_list:       dbus-python-1.1.1-1.fc18.x86_64
executable:     /usr/sbin/liveusb-creator
kernel:         3.7.2-201.fc18.x86_64.debug
uid:            0

Truncated backtrace:
creator.py:456:handle_reply:UnicodeEncodeError: 'ascii' codec can't encode characters in position 16-17: ordinal not in range(128)

Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/dbus/connection.py", line 604, in msg_reply_handler
    reply_handler(*message.get_args_list(**get_args_opts))
  File "/usr/lib/python2.7/site-packages/liveusb/creator.py", line 456, in handle_reply
    'mount': map(str, list(dev.Get(device, 'DeviceMountPaths'))),
UnicodeEncodeError: 'ascii' codec can't encode characters in position 16-17: ordinal not in range(128)

Local variables in innermost frame:
iface: 'usb'
dev_obj: <ProxyObject wrapping <dbus._dbus.SystemBus (system) at 0x246fcb0> :1.237 /org/freedesktop/UDisks/devices/sdb1 at 0x27b58d0>
dbus: <module 'dbus' from '/usr/lib/python2.7/site-packages/dbus/__init__.pyc'>
devices: dbus.Array([dbus.ObjectPath('/org/freedesktop/UDisks/devices/sda1'), dbus.ObjectPath('/org/freedesktop/UDisks/devices/sda2'), dbus.ObjectPath('/org/freedesktop/UDisks/devices/sda3'), dbus.ObjectPath('/org/freedesktop/UDisks/devices/sdb'), dbus.ObjectPath('/org/freedesktop/UDisks/devices/sdb1'), dbus.ObjectPath('/org/freedesktop/UDisks/devices/sda'), dbus.ObjectPath('/org/freedesktop/UDisks/devices/sr0')], signature=dbus.Signature('o'))
callback: <function add_devices at 0x26d3500>
dev: <Interface <ProxyObject wrapping <dbus._dbus.SystemBus (system) at 0x246fcb0> :1.237 /org/freedesktop/UDisks/devices/sdb1 at 0x27b58d0> implementing 'org.freedesktop.DBus.Properties' at 0x27b5810>
device: dbus.ObjectPath('/org/freedesktop/UDisks/devices/sdb1')
data: {'parent': None, 'fstype': '', 'fsversion': '', 'device': '/dev/sdb', 'is_optical': False, 'size': 8010194944, 'udi': '/org/freedesktop/UDisks/devices/sdb', 'uuid': '', 'bootable': False, 'mount': [], 'label': u''}
self: <liveusb.creator.LinuxLiveUSBCreator object at 0x27b5250>