Version-Release number of selected component:
system-config-printer-1.5.4-1.fc21

Additional info:
reporter:       libreport-2.3.0
cmdline:        /usr/bin/python3 /usr/share/system-config-printer/system-config-printer.py
executable:     /usr/share/system-config-printer/system-config-printer.py
kernel:         3.18.5-201.fc21.x86_64
runlevel:       N 5
type:           Python3
uid:            1002

Truncated backtrace:
firewallsettings.py:216:error_handler:TypeError: 'NoneType' object is not callable

Traceback (most recent call last):
  File "/usr/lib64/python3.4/site-packages/dbus/connection.py", line 607, in msg_reply_handler
    *message.get_args_list()))
  File "/usr/share/system-config-printer/firewallsettings.py", line 216, in error_handler
    self._client_error_handler (exc)
TypeError: 'NoneType' object is not callable

Local variables in innermost frame:
exc: DBusException(dbus.String('Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.'),)
self: <firewallsettings.SystemConfigFirewall object at 0x7ff2f76256a0>

Potential duplicate: bug 1179590