[Bug 1068680] [NEW] Software center does not start [dbus.proxies - ERROR - Introspect error]

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If I type
 software-center
in the terminal, I get the following error and the program do not start:
2012-10-19 11:47:14,260 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 'None'
2012-10-19 11:47:14,369 - softwarecenter.db.database - INFO - open() database: path=None use_axi=True use_agent=True
2012-10-19 11:47:17,104 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/proxies.py', 410, '_introspect_error_handler')'
2012-10-19 11:47:17,104 - dbus.proxies - ERROR - Introspect error on com.ubuntu.sso:/com/ubuntu/sso/credentials: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: Process /usr/lib/ubuntu-sso-client/ubuntu-sso-login exited with status 1
Traceback (most recent call last):
  File "/usr/bin/software-center", line 130, in <module>
    app = SoftwareCenterAppGtk3(options, args)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 337, in __init__
    self.icons)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/session/appmanager.py", line 66, in __init__
    self.oauth_token = helper.find_oauth_token_sync()
  File "/usr/share/software-center/softwarecenter/backend/ubuntusso.py", line 139, in find_oauth_token_sync
    sso.find_credentials()
  File "/usr/share/software-center/softwarecenter/backend/login_impl/login_sso.py", line 75, in find_credentials
    self.proxy.find_credentials(self.appname, self._get_params())
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 70, in __call__
    return self._proxy_method(*args, **keywords)
  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)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: Process /usr/lib/ubuntu-sso-client/ubuntu-sso-login exited with status 1

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: software-center 5.4.1.2
ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
Uname: Linux 3.5.0-17-generic i686
ApportVersion: 2.6.1-0ubuntu3
Architecture: i386
Date: Fri Oct 19 11:48:12 2012
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release i386 (20121017.2)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=pt_BR:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=pt_BR.UTF-8
 SHELL=/bin/bash
SourcePackage: software-center
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubuntu-sso-client
     Importance: Undecided
         Status: New

** Affects: dbus-python (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: apport-bug i386 quantal running-unity
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Software center does not start [dbus.proxies - ERROR - Introspect error]
https://bugs.launchpad.net/bugs/1068680
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