unity-lens-photos crashed with RuntimeError in updatecache(): Couldn't find GType of implementor of interface UnityMergeStrategy. Forgot to set __gtype_name__?

crashes on startup

ProblemType: Crash
DistroRelease: Ubuntu 12.10
Package: unity-lens-photos 0.9-0ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-23.35-generic 3.5.7.2
Uname: Linux 3.5.0-23-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.6.1-0ubuntu10
Architecture: amd64
CrashCounter: 1
Date: Sun Feb 3 16:34:58 2013
ExecutablePath: /usr/lib/unity-lens-photos/unity-lens-photos
InstallationDate: Installed on 2012-10-25 (100 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
InterpreterPath: /usr/bin/python3.2mu
MarkForUpload: True
PackageArchitecture: all
ProcCmdline: /usr/bin/python3 /usr/lib/unity-lens-photos/unity-lens-photos
ProcEnviron:
 SHELL=/bin/bash
 XDG_RUNTIME_DIR=<set>
 PATH=(custom, no user)
 LANGUAGE=en_AU:en
 LANG=en_AU.UTF-8
PythonArgs: ['/usr/lib/unity-lens-photos/unity-lens-photos']
SourcePackage: unity-lens-photos
Title: unity-lens-photos crashed with RuntimeError in updatecache(): Couldn't find GType of implementor of interface UnityMergeStrategy. Forgot to set __gtype_name__?
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip fuse lpadmin plugdev sambashare sudo