bzr crashed with TypeError in readheaders(): readline() takes exactly 1 argument (2 given)

Binary package hint: bzr

just typed bzr branch lp:wizardpen into terminal

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: bzr 2.3.0~beta3-1build1
ProcVersionSignature: Ubuntu 2.6.37-11.25-generic 2.6.37-rc7
Uname: Linux 2.6.37-11-generic x86_64
Architecture: amd64
BzrDebugFlags: set()
BzrPlugins:
 bash_completion /usr/lib/python2.7/dist-packages/bzrlib/plugins/bash_completion [2.3b3]
   bzrtools /usr/lib/python2.7/dist-packages/bzrlib/plugins/bzrtools [2.3.0]
   launchpad /usr/lib/python2.7/dist-packages/bzrlib/plugins/launchpad [2.3b3]
   netrc_credential_store /usr/lib/python2.7/dist-packages/bzrlib/plugins/netrc_credential_store [2.3b3]
   news_merge /usr/lib/python2.7/dist-packages/bzrlib/plugins/news_merge [2.3b3]
BzrVersion: 2.3b3
CommandLine: ['/usr/bin/bzr', 'branch', 'lp:wizardpen']
CrashDb: bzr
Date: Mon Jan 3 11:14:43 2011
ExecutablePath: /usr/bin/bzr
FileSystemEncoding: UTF-8
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
InterpreterPath: /usr/bin/python2.7
Locale: en_GB.utf8
Platform: Linux-2.6.37-11-generic-x86_64-with-Ubuntu-11.04-natty
ProcCmdline: /usr/bin/python /usr/bin/bzr branch lp:wizardpen
ProcEnviron:
 SHELL=/bin/bash
 LC_MESSAGES=en_GB.utf8
 LANG=en_GB.utf8
 LANGUAGE=en_GB:cs_CZ:cs:en
PythonVersion: 2.7.1
SourcePackage: bzr
Title: bzr crashed with TypeError in readheaders(): readline() takes exactly 1 argument (2 given)
UserEncoding: UTF-8
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare