Cannot work with bzr repository. bzr: ERROR: exceptions.ValueError: invalid literal for int() with base 10: 'None

[Michael Farrugia]

We are getting this error each time we try to operate (status, commit, update, etc) on the repository;

bzr: ERROR: exceptions.ValueError: invalid literal for int() with base 10: 'None
'

Traceback (most recent call last):
  File "bzrlib\commands.pyo", line 946, in exception_to_return_code
  File "bzrlib\commands.pyo", line 1150, in run_bzr
  File "C:/Program Files/Bazaar/plugins\loom\commands.py", line 201, in run_argv
_aliases
  File "bzrlib\commands.pyo", line 699, in run_argv_aliases
  File "bzrlib\commands.pyo", line 721, in run
  File "bzrlib\cleanup.pyo", line 135, in run_simple
  File "bzrlib\cleanup.pyo", line 165, in _do_with_cleanups
  File "bzrlib\commands.pyo", line 1165, in ignore_pipe
  File "bzrlib\builtins.pyo", line 294, in run
  File "bzrlib\workingtree.pyo", line 330, in open_containing_paths
  File "bzrlib\views.pyo", line 112, in lookup_view
  File "bzrlib\views.pyo", line 178, in _load_view_info
  File "bzrlib\workingtree_4.pyo", line 607, in lock_read
  File "bzrlib\branch.pyo", line 2469, in lock_read
  File "bzrlib\repofmt\pack_repo.pyo", line 1787, in lock_read
  File "bzrlib\repofmt\pack_repo.pyo", line 1703, in _refresh_data
  File "bzrlib\repofmt\pack_repo.pyo", line 1455, in reload_pack_names
  File "bzrlib\repofmt\pack_repo.pyo", line 1087, in ensure_loaded
  File "bzrlib\repofmt\pack_repo.pyo", line 1098, in _parse_index_sizes
ValueError: invalid literal for int() with base 10: 'None'

bzr 2.4.1 on python 2.6.6 (Windows-2003Server-5.2.3790-SP2)
arguments: ['bzr', 'status']
plugins: bzrtools[2.4.0], changelog_merge[2.4.1], colo[0.3.1dev],
    explorer[1.2.1], fastimport[0.12.0dev], launchpad[2.4.1], loom[2.2.1dev],
    netrc_credential_store[2.4.1], news_merge[2.4.1], pipeline[1.1.0],
    qbzr[0.21.1], rewrite[0.6.3dev], svn[1.1.0], upload[1.0.1dev],
    xmloutput[0.8.7]
encoding: 'cp1252', fsenc: 'mbcs', lang: None

*** Bazaar has encountered an internal error. This probably indicates a
    bug in Bazaar. You can help us fix it by filing a bug report at
        https://bugs.launchpad.net/bzr/+filebug
    including this traceback and a description of the problem.

Grateful for any help.

Mike

[Martin Packman (gz)]

What is the problem repository, and did you notice a particular point at which it started breaking? If so, checking your .bzr.log for around then may be useful. See the existing bug for more information and debugging suggestions.