Attempting to enable Magnatune Plugin crashes Rhythmbox

[Vinod]

Start Rhythmbox. Click 'Edit > Plugins'. Select 'Magnatune Store' checkbox. Rhythmbox crashes with this error message:

/usr/lib/python2.7/dist-packages/gobject/constants.py:24: Warning: g_boxed_type_register_static: assertion `g_type_from_name (name) == 0' failed
  import gobject._gobject
TypeError: metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases
**
ERROR:/build/buildd/pygobject-3.0.0/gi/_gobject/pygobject.c:929:pygobject_new_full: assertion failed: (tp != NULL)
Aborted

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: rhythmbox 2.90.1~20110908-0ubuntu1.1
ProcVersionSignature: Ubuntu 3.0.0-14.23-generic-pae 3.0.9
Uname: Linux 3.0.0-14-generic-pae i686
ApportVersion: 1.23-0ubuntu4
Architecture: i386
Date: Thu Jan 19 08:34:33 2012
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: rhythmbox
UpgradeStatus: Upgraded to oneiric on 2012-01-06 (12 days ago)

[Launchpad Janitor (janitor)]

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