bzr crashed with AssertionError in create_from_tree(): Unknown kind 'tree-reference'

[David Barth]

Binary package hint: bzr

The error occured as I was trying:
 bzr pull git://anongit.compiz.org/compiz/plugins-main
in a bzr repository init'ed with:
 bzr init --format="development-subtree"

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: bzr 2.3.1-1ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-7.38-generic 2.6.38
Uname: Linux 2.6.38-7-generic i686
Architecture: i386
BzrDebugFlags: set()
BzrVersion: 2.3.1
CommandLine: ['/usr/bin/bzr', 'pull', 'git://anongit.compiz.org/compiz/plugins-main']
CrashDb: bzr
Date: Tue Mar 29 18:10:43 2011
ExecutablePath: /usr/bin/bzr
FileSystemEncoding: UTF-8
InterpreterPath: /usr/bin/python2.7
Locale: en_US.UTF-8
Platform: Linux-2.6.38-7-generic-i686-with-Ubuntu-11.04-natty
ProcCmdline: /usr/bin/python /usr/bin/bzr pull git://anongit.compiz.org/compiz/plugins-main
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, user)
 LANG=en_US.UTF-8
 LANGUAGE=en_US:en
PythonVersion: 2.7.1
SourcePackage: bzr
Title: bzr crashed with AssertionError in create_from_tree(): Unknown kind 'tree-reference'
UpgradeStatus: Upgraded to natty on 2010-11-25 (124 days ago)
UserEncoding: UTF-8
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare