Comment 21 for bug 915626

Can't reproduce but the following unhandled errors which appear commonly in the duplicate bugs look interesting:

usb-creator 2012-08-29 20:43:36,058 (ERROR) connection.py:646: Unable to set arguments (None,) according to signature u's': <type 'exceptions.TypeError'>: Expected a string or unicode object
usb-creator 2012-08-29 20:43:36,058 (ERROR) frontend.py:679: Installation failed.
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/usbcreator/frontends/gtk/frontend.py", line 616, in install
    allow_system_internal=self.allow_system_internal)
  File "/usr/lib/python2.7/dist-packages/usbcreator/backends/udisks/backend.py", line 349, in install
    self.helper.Unmount(target)
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 641, in call_blocking
    message.append(signature=signature, *args)
TypeError: Expected a string or unicode object

usb-creator 2012-08-25 12:20:49,988 (ERROR) backend.py:155: Could not mount the device:
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/usbcreator/backends/udisks/backend.py", line 153, in _add_partition
    self.retry_mount(device)
  File "/usr/lib/python2.7/dist-packages/usbcreator/backends/udisks/backend.py", line 45, in retry_mount
    device_i.FilesystemMount('', [])
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)
DBusException: org.freedesktop.UDisks.Error.FilesystemDriverMissing: Error mounting: mount: no medium found on /dev/sdb1