bazaar explorer gives internal error

[Alan Reed]

bzr: ERROR: subvertpy.SubversionException: ("This client is too old to work with working copy 'C:\\Users\\Alan\\Desktop\\COM-PROJECT\\COMdocs\\helpfiles\\tex2rtf'. You need\nto get a newer Subversion client, or to downgrade this working copy.\nSee http://subversion.tigris.org/faq.html#working-copy-format-change\nfor details.", 155021)

Traceback (most recent call last):
  File "C:/Program Files (x86)/Bazaar/plugins\explorer\lib\explorer.py", line 1524, in callable_with_cleanup
  File "C:/Program Files (x86)/Bazaar/plugins\explorer\lib\explorer.py", line 1689, in _open_location_task
  File "C:/Program Files (x86)/Bazaar/plugins\explorer\lib\explorer.py", line 1703, in _show_unable_to_open_location
  File "C:/Program Files (x86)/Bazaar/plugins\explorer\lib\explorer.py", line 1727, in open_virtual_repo
  File "C:/Program Files (x86)/Bazaar/plugins\explorer\lib\location_viewer.py", line 163, in add_location
  File "C:/Program Files (x86)/Bazaar/plugins\explorer\lib\location.py", line 178, in view
  File "C:/Program Files (x86)/Bazaar/plugins\explorer\lib\view_repository.py", line 292, in ui
  File "C:/Program Files (x86)/Bazaar/plugins\explorer\lib\view_repository.py", line 296, in refresh_view
  File "C:/Program Files (x86)/Bazaar/plugins\explorer\lib\view_repository.py", line 326, in _collect_data
  File "bzrlib\controldir.pyo", line 545, in find_bzrdirs
  File "bzrlib\controldir.pyo", line 718, in open_from_transport
  File "bzrlib\transport\__init__.pyo", line 1719, in do_catching_redirections
  File "bzrlib\controldir.pyo", line 706, in find_format
  File "bzrlib\controldir.pyo", line 1151, in find_format
  File "C:/Program Files (x86)/Bazaar/plugins\svn\__init__.py", line 179, in probe_transport
SubversionException: ("This client is too old to work with working copy 'C:\\Users\\Alan\\Desktop\\COM-PROJECT\\COMdocs\\helpfiles\\tex2rtf'. You need\nto get a newer Subversion client, or to downgrade this working copy.\nSee http://subversion.tigris.org/faq.html#working-copy-format-change\nfor details.", 155021)

bzr 2.6b1 on python 2.6.6 (win32)
arguments: ['C:\\Program Files (x86)\\Bazaar\\tbzrcommand.exe', '--command=explorer', '--dir=C:\\Users\\Alan\\Desktop\\COM-PROJECT']
encoding: 'cp1252', fsenc: 'mbcs', lang: None
plugins:
  bzrtools C:\Program Files (x86)\Bazaar\plugins\bzrtools [2.5.0]
  changelog_merge C:\Program Files (x86)\Bazaar\plugins\changelog_merge [2.6b1]
  colo C:\Program Files (x86)\Bazaar\plugins\colo [0.4.0]
  explorer C:\Program Files (x86)\Bazaar\plugins\explorer [1.3.0dev]
  fastimport C:\Program Files (x86)\Bazaar\plugins\fastimport [0.14.0dev]
  git C:\Program Files (x86)\Bazaar\plugins\git [0.6.8dev]
  launchpad C:\Program Files (x86)\Bazaar\plugins\launchpad [2.6b1]
  loom C:\Program Files (x86)\Bazaar\plugins\loom [2.3.0dev]
  netrc_credential_store C:\Program Files (x86)\Bazaar\plugins\netrc_credential_store [2.6b1]
  news_merge C:\Program Files (x86)\Bazaar\plugins\news_merge [2.6b1]
  pipeline C:\Program Files (x86)\Bazaar\plugins\pipeline [1.4.0]
  qbzr C:\Program Files (x86)\Bazaar\plugins\qbzr [0.23.0dev]
  rewrite C:\Program Files (x86)\Bazaar\plugins\rewrite [0.6.4dev]
  svn C:\Program Files (x86)\Bazaar\plugins\svn [1.2.2dev]
  upload C:\Program Files (x86)\Bazaar\plugins\upload [1.2.0dev]
  xmloutput C:\Program Files (x86)\Bazaar\plugins\xmloutput [0.8.8]