bzr diff --prefix lilegal_value

cherokee@cherokee-desktop:~$ bzr diff --prefix lilegal_value
Bzrtools is not up to date with installed bzr version 0.14.0.
There should be a newer version available, e.g. 0.14.
Unable to load plugin 'bzrtools' from '/usr/lib/python2.4/site-packages/bzrlib/plugins'
bzr: ERROR: exceptions.NameError: global name 'BzrCommandError' is not defined

Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/bzrlib/commands.py", line 650, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/usr/lib/python2.4/site-packages/bzrlib/commands.py", line 612, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.4/site-packages/bzrlib/commands.py", line 304, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.4/site-packages/bzrlib/commands.py", line 622, in ignore_pipe
    result = func(*args, **kwargs)
  File "/usr/lib/python2.4/site-packages/bzrlib/builtins.py", line 1227, in run
    raise BzrCommandError(
NameError: global name 'BzrCommandError' is not defined

bzr 0.14.0 on python 2.4.4.candidate.1 (linux2)
arguments: ['/usr/bin/bzr', 'diff', '--prefix', 'lilegal_value']

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cherokee@cherokee-desktop:~$