Software Center crashes on launch

[Julian Tapping]

Ubuntu 13.04. Software Center opens for a few second and then crashes. The following messages appear:

WARNING:softwarecenter.db.update:The file: '/usr/share/app-install/desktop/workrave:workrave.desktop' could not be read correctly. The application associated with this file will not be included in the software catalog. Please consider raising a bug report for this issue with the maintainer of that application

WARNING:softwarecenter.db.update:The file: '/usr/share/app-install/desktop/sonic-visualiser:x-sonicvisualiser.desktop' could not be read correctly. The application associated with this file will not be included in the software catalog. Please consider raising a bug report for this issue with the maintainer of that application

TypeError: argument instance: Expected GObject.Object, but got PyCObject

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: software-center 5.6.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.8.0-30.44-generic 3.8.13.6
Uname: Linux 3.8.0-30-generic i686
NonfreeKernelModules: fglrx
ApportVersion: 2.9.2-0ubuntu8.3
Architecture: i386
Date: Mon Sep 23 15:53:01 2013
MarkForUpload: True
PackageArchitecture: all
SourcePackage: software-center
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[dino99 (9d9)]

That version is no more maintained