bzr: ERROR: zlib.error: Error -5 while decompressing data: incomplete or truncated stream

Hello,

I get this error while trying to open a repo in explorer or to pull in the same repo from the console.

here is the traceback:
C:\Users\Administrateur\Documents\workspace\6.1-openobject-addons>bzr pull
bzr: ERROR: zlib.error: Error -5 while decompressing data: incomplete or truncat
ed stream

Traceback (most recent call last):
  File "bzrlib\commands.pyo", line 920, in exception_to_return_code
  File "bzrlib\commands.pyo", line 1131, in run_bzr
  File "bzrlib\commands.pyo", line 673, in run_argv_aliases
  File "bzrlib\commands.pyo", line 695, in run
  File "bzrlib\cleanup.pyo", line 136, in run_simple
  File "bzrlib\cleanup.pyo", line 166, in _do_with_cleanups
  File "bzrlib\builtins.pyo", line 1179, in run
  File "bzrlib\workingtree_4.pyo", line 646, in lock_write
  File "bzrlib\branch.pyo", line 2523, in lock_write
  File "bzrlib\repofmt\pack_repo.pyo", line 1783, in lock_write
  File "bzrlib\repofmt\pack_repo.pyo", line 1719, in _refresh_data
  File "bzrlib\repofmt\pack_repo.pyo", line 1467, in reload_pack_names
  File "bzrlib\repofmt\pack_repo.pyo", line 1087, in ensure_loaded
  File "bzrlib\btree_index.pyo", line 1005, in iter_all_entries
  File "bzrlib\btree_index.pyo", line 1452, in key_count
  File "bzrlib\btree_index.pyo", line 949, in _get_root_node
  File "bzrlib\btree_index.pyo", line 974, in _get_internal_nodes
  File "bzrlib\btree_index.pyo", line 966, in _get_nodes
  File "bzrlib\btree_index.pyo", line 743, in _get_and_cache_nodes
  File "bzrlib\btree_index.pyo", line 1573, in _read_nodes
error: Error -5 while decompressing data: incomplete or truncated stream

bzr 2.5.1 on python 2.6.6 (Windows-7-6.1.7601-SP1)
arguments: ['bzr', 'pull']
plugins: bzrtools[2.5.0], changelog_merge[2.5.1], colo[0.4.0],
    explorer[1.2.2], fastimport[0.14.0dev], git[0.6.8], launchpad[2.5.1],
    loom[2.3.0dev], netrc_credential_store[2.5.1], news_merge[2.5.1],
    pipeline[1.4.0], qbzr[0.22.3], rewrite[0.6.4dev], svn[1.2.2],
    upload[1.2.0dev], xmloutput[0.8.8]
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.

Thank you so much for any help!
regards,
Bogdan