Description of problem:
Attempted to use system-config-printers and when it asked to allow ipp traffic through the firewall I selected allow. This error occured just  after that.

Version-Release number of selected component:
system-config-printer-1.4.0-2.fc20

Additional info:
cmdline:        /usr/bin/python /usr/share/system-config-printer/system-config-printer.py
executable:     /usr/share/system-config-printer/system-config-printer.py
kernel:         3.9.0-0.rc6.git2.2.fc20.x86_64
runlevel:       N 5
uid:            1000
ureports_counter: 1

Truncated backtrace:
connection.py:651:call_blocking:DBusException: org.freedesktop.DBus.Python.dbus.exceptions.DBusException: must be unicode, not str

Traceback (most recent call last):
  File "/usr/share/system-config-printer/newprinter.py", line 1978, in adjust_firewall_response
    self.firewall.write ()
  File "/usr/share/system-config-printer/firewallsettings.py", line 114, in write
    self._zone.update (self._fw_data)
  File "<string>", line 2, in update
  File "/usr/lib/python2.7/site-packages/slip/dbus/polkit.py", line 103, in _enable_proxy
    return func(*p, **k)
  File "<string>", line 2, in update
  File "/usr/lib/python2.7/site-packages/firewall/client.py", line 46, in handle_exceptions
    return func(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/firewall/client.py", line 235, in update
    self.fw_zone.update(tuple(settings.settings))
  File "/usr/lib/python2.7/site-packages/slip/dbus/proxies.py", line 50, in __call__
    return dbus.proxies._ProxyMethod.__call__(self, *args, **kwargs)
  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.Python.dbus.exceptions.DBusException: must be unicode, not str

Local variables in innermost frame:
byte_arrays: False
self: <dbus._dbus.SystemBus (system) at 0x1c78710>
args: (('', 'Public', 'For use in public areas. You do not trust the other computers on networks to not harm your computer. Only selected incoming connections are accepted.', False, '{chain}_ZONE_{zone}', ['ssh', 'mdns', 'dhcpv6-client', 'ipp-client', 'ipp'], [], [], False, []),)
object_path: '/org/fedoraproject/FirewallD1/config/zone/6'
signature: u'(sssbsasa(ss)asba(ssss))'
bus_name: dbus.UTF8String(':1.6')
get_args_opts: {'byte_arrays': False, 'utf8_strings': False}
timeout: 2147483.647
kwargs: {}
dbus_interface: 'org.fedoraproject.FirewallD1.config.zone'
message: <dbus.lowlevel.MethodCallMessage path: /org/fedoraproject/FirewallD1/config/zone/6, iface: org.fedoraproject.FirewallD1.config.zone, member: update dest: :1.6>
method: 'update'