Description of problem:
trying to create a Fedora 21 Live USB ... using live usb-creator

Version-Release number of selected component:
liveusb-creator-3.12.0-1.fc20

Additional info:
reporter:       libreport-2.2.3
cmdline:        /usr/bin/python -tt /sbin/liveusb-creator
dso_list:       dbus-python-1.2.0-1.fc20.i686
executable:     /sbin/liveusb-creator
kernel:         3.17.6-200.fc20.i686
runlevel:       N 5
type:           Python
uid:            0

Truncated backtrace:
connection.py:651:call_blocking:DBusException: org.freedesktop.DBus.Error.UnknownMethod: Method "Get" with signature "os" on interface "org.freedesktop.DBus.Properties" doesn't exist


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 463, in handle_reply
    'is_optical': bool(dev.Get(device, 'DeviceIsOpticalDisc')),
  File "/usr/lib/python2.7/site-packages/dbus/proxies.py", line 70, in __call__
    return self._proxy_method(*args, **keywords)
  File "/usr/lib/python2.7/site-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib/python2.7/site-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)
DBusException: org.freedesktop.DBus.Error.UnknownMethod: Method "Get" with signature "os" on interface "org.freedesktop.DBus.Properties" doesn't exist


Local variables in innermost frame:
byte_arrays: False
self: <dbus._dbus.SystemBus (system) at 0xa3a9dac>
args: (dbus.ObjectPath('/org/freedesktop/UDisks/devices/sdf'), 'DeviceIsOpticalDisc')
object_path: dbus.ObjectPath('/org/freedesktop/UDisks/devices/sdf')
signature: None
bus_name: dbus.UTF8String(':1.108')
get_args_opts: {'byte_arrays': False, 'utf8_strings': False}
timeout: -1.0
kwargs: {}
dbus_interface: 'org.freedesktop.DBus.Properties'
message: <dbus.lowlevel.MethodCallMessage path: /org/freedesktop/UDisks/devices/sdf, iface: org.freedesktop.DBus.Properties, member: Get dest: :1.108>
method: 'Get'

Potential duplicate: bug 903927