ubuntuone-syncdaemon crashed with TypeError in open_control_panel(): constructor returned NULL

I just chose "Open Ubuntu One" from the menu at the top-right corner of the screen.

ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: ubuntuone-client 13.10-0ubuntu1 [origin: unknown]
ProcVersionSignature: Ubuntu 3.13.0-23.45-generic 3.13.8
Uname: Linux 3.13.0-23-generic x86_64
ApportVersion: 2.14.1-0ubuntu1
Architecture: amd64
CrashDB: ubuntuone
CurrentDesktop: Unity
Date: Sat Apr 5 14:01:07 2014
ExecutablePath: /usr/lib/ubuntuone-client/ubuntuone-syncdaemon
InstallationDate: Installed on 2011-10-17 (900 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/lib/ubuntuone-client/ubuntuone-syncdaemon
ProcEnviron:
 XDG_RUNTIME_DIR=<set>
 SHELL=/bin/bash
 LANGUAGE=en_GB:en
 PATH=(custom, user)
 LANG=en_GB.UTF-8
PythonArgs: ['/usr/lib/ubuntuone-client/ubuntuone-syncdaemon']
SourcePackage: ubuntuone-client
ThirdParty: True
Title: ubuntuone-syncdaemon crashed with TypeError in open_control_panel(): constructor returned NULL
Traceback:
 Traceback (most recent call last):
   File "/usr/lib/python2.7/dist-packages/ubuntuone-client/ubuntuone/platform/sync_menu/linux.py", line 196, in open_control_panel
     app = Gio.DesktopAppInfo.new(CLIENT_DESKTOP_ID)
 TypeError: constructor returned NULL
UpgradeStatus: Upgraded to trusty on 2014-04-05 (0 days ago)
UserGroups: adm admin cdrom dialout libvirtd lp lpadmin plugdev sambashare