Software Center has error when installing local .deb

[Rick Spencer]

Binary package hint: software-center

Installing a local deb file, Software Center provided this error:
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/aptdaemon/worker.py", line 963, in simulate
    status_path)
  File "/usr/lib/python2.7/dist-packages/aptdaemon/worker.py", line 1063, in _simulate_helper
    trans.packages[PKGS_INSTALL] = [deb.pkgname]
TypeError: 'dbus.Struct' object does not support item assignment

The deb installed fine with dpkg -i

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: software-center 3.1.22
ProcVersionSignature: Ubuntu 2.6.38-5.32-generic 2.6.38-rc6
Uname: Linux 2.6.38-5-generic i686
Architecture: i386
Date: Fri Mar 4 16:50:40 2011
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: software-center
UpgradeStatus: Upgraded to natty on 2010-11-16 (108 days ago)