SVN subvert.SubversionException

In a SVN drirectory I click windows explorer menu -> Bazaar Explorer item.
Exception
It is not problem, but ugly.

bzr: ERROR: subvertpy.SubversionException: ("This client is too old to work with working copy 'C:\\KissZol\\ber2012'. 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/Bazaar/plugins\explorer\lib\explorer.py", line 1518, in callable_with_cleanup
  File "C:/Program Files/Bazaar/plugins\explorer\lib\explorer.py", line 1678, in _open_location_task
  File "C:/Program Files/Bazaar/plugins\explorer\lib\location.py", line 160, in __init__
  File "C:/Program Files/Bazaar/plugins\explorer\lib\location.py", line 222, in reopen_location
  File "bzrlib\controldir.pyo", line 811, in open_containing_tree_branch_or_repository
  File "bzrlib\controldir.pyo", line 732, in open_containing
  File "bzrlib\controldir.pyo", line 753, in open_containing_from_transport
  File "bzrlib\controldir.pyo", line 716, in open_from_transport
  File "bzrlib\transport\__init__.pyo", line 1718, in do_catching_redirections
  File "bzrlib\controldir.pyo", line 704, in find_format
  File "bzrlib\controldir.pyo", line 1149, in find_format
  File "C:/Program Files/Bazaar/plugins\svn\__init__.py", line 167, in probe_transport
SubversionException: ("This client is too old to work with working copy 'C:\\KissZol\\ber2012'. 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 2.5.1 on python 2.6.6 (win32)
arguments: ['C:\\Program Files\\Bazaar\\tbzrcommand.exe', '--command=explorer', '--file=C:\\KissZol\\ber2012\\KozosSource']
encoding: 'cp1250', fsenc: 'mbcs', lang: None
plugins:
  bzrtools C:\Program Files\Bazaar\plugins\bzrtools [2.5.0]
  changelog_merge C:\Program Files\Bazaar\plugins\changelog_merge [2.5.1]
  colo C:\Program Files\Bazaar\plugins\colo [0.4.0]
  explorer C:\Program Files\Bazaar\plugins\explorer [1.2.2]
  fastimport C:\Program Files\Bazaar\plugins\fastimport [0.14.0dev]
  git C:\Program Files\Bazaar\plugins\git [0.6.8]
  launchpad C:\Program Files\Bazaar\plugins\launchpad [2.5.1]
  loom C:\Program Files\Bazaar\plugins\loom [2.3.0dev]
  netrc_credential_store C:\Program Files\Bazaar\plugins\netrc_credential_store [2.5.1]
  news_merge C:\Program Files\Bazaar\plugins\news_merge [2.5.1]
  pipeline C:\Program Files\Bazaar\plugins\pipeline [1.4.0]
  qbzr C:\Program Files\Bazaar\plugins\qbzr [0.22.3]
  rewrite C:\Program Files\Bazaar\plugins\rewrite [0.6.4dev]
  svn C:\Program Files\Bazaar\plugins\svn [1.2.2]
  upload C:\Program Files\Bazaar\plugins\upload [1.2.0dev]
  xmloutput C:\Program Files\Bazaar\plugins\xmloutput [0.8.8]