software-center crashed with DBusException in call_blocking(): org.freedesktop.DBus.Error.Spawn.ChildExited: Process /usr/share/oneconf/oneconf-service exited with status 1

The software-center crashed, when i will to install ttf-mscorefonts-installer.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: software-center 5.1.10
ProcVersionSignature: Ubuntu 3.2.0-17.27-generic-pae 3.2.6
Uname: Linux 3.2.0-17-generic-pae i686
ApportVersion: 1.93-0ubuntu2
Architecture: i386
CrashCounter: 1
Date: Sat Feb 25 00:27:06 2012
ExecutablePath: /usr/share/software-center/software-center
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 (20120223.1)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/software-center /var/cache/apt/archives/ttf-mscorefonts-installer_3.4ubuntu2_all.deb
ProcEnviron:
 TERM=unknown
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/software-center', '/var/cache/apt/archives/ttf-mscorefonts-installer_3.4ubuntu2_all.deb']
SourcePackage: software-center
Title: software-center crashed with DBusException in call_blocking(): org.freedesktop.DBus.Error.Spawn.ChildExited: Process /usr/share/oneconf/oneconf-service exited with status 1
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: