when i create a repo,it crashes

[cowboy]

bzr: ERROR: exceptions.TypeError: argument 1 of PyQt4.QtCore.QVariant() has an invalid type

Traceback (most recent call last):
  File "C:/Program Files (x86)/Bazaar/plugins\explorer\lib\explorer.py", line 1450, in callable_with_cleanup
  File "C:/Program Files (x86)/Bazaar/plugins\explorer\lib\explorer.py", line 1618, in _open_location_task
  File "C:/Program Files (x86)/Bazaar/plugins\explorer\lib\location_viewer.py", line 161, 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 272, in ui
  File "C:/Program Files (x86)/Bazaar/plugins\explorer\lib\view_repository.py", line 277, in refresh_view
  File "C:/Program Files (x86)/Bazaar/plugins\explorer\lib\view_repository.py", line 287, in _update_view
  File "C:/Program Files (x86)/Bazaar/plugins\explorer\lib\view_repository.py", line 394, in _update_model
  File "C:/Program Files (x86)/Bazaar/plugins\explorer\widgets\conditional_dataview.py", line 109, in setData
  File "C:/Program Files (x86)/Bazaar/plugins\explorer\widgets\conditional_dataview.py", line 172, in set_raw_data
TypeError: argument 1 of PyQt4.QtCore.QVariant() has an invalid type

bzr 2.2.1 on python 2.6.4 (win32)
arguments: ['C:\\Program Files (x86)\\Bazaar\\bzrw.exe', 'explorer']
encoding: 'cp932', fsenc: 'mbcs', lang: None
plugins:
  bzrtools C:\Program Files (x86)\Bazaar\plugins\bzrtools [2.2.0]
  colo C:\Program Files (x86)\Bazaar\plugins\colo [0.1.0]
  explorer C:\Program Files (x86)\Bazaar\plugins\explorer [1.1.0]
  fastimport C:\Program Files (x86)\Bazaar\plugins\fastimport [0.9.0dev]
  launchpad C:\Program Files (x86)\Bazaar\plugins\launchpad [2.2.1]
  loom C:\Program Files (x86)\Bazaar\plugins\loom [2.2.1dev]
  netrc_credential_store C:\Program Files (x86)\Bazaar\plugins\netrc_credential_store [2.2.1]
  news_merge C:\Program Files (x86)\Bazaar\plugins\news_merge [2.2.1]
  pipeline C:\Program Files (x86)\Bazaar\plugins\pipeline [unknown]
  qbzr C:\Program Files (x86)\Bazaar\plugins\qbzr [0.19.2]
  rewrite C:\Program Files (x86)\Bazaar\plugins\rewrite [0.6.1]
  svn C:\Program Files (x86)\Bazaar\plugins\svn [1.0.4]
  upload C:\Program Files (x86)\Bazaar\plugins\upload [1.0.0dev]
  xmloutput C:\Program Files (x86)\Bazaar\plugins\xmloutput [0.8.6]