boa constructo启动失败

我在装完:wxPython2.7-win32-unicode-2.7.1.3-py25.exe与boa-constructor-0.4.4.win32.exe后,我直接运行:\Python25\Lib\site-packages\boa-constructor\Boa.py,运行情况如下:
C:\Documents and Settings\Administrator>C:
Starting Boa Constructor v0.4.4
importing wxPython
reading user preferences
running main...
importing Models.Controllers
importing Models.EditorModels
importing Views
importing Views.SourceViews
C:\Python25\Lib\site-packages\boa-construc
package is no longer automatically genera
e.
  import wxPython.stc # needed names from
importing Explorers.ExplorerNodes
importing Companions
importing PropertyEditors
importing Companions.FrameCompanions
importing Companions.WizardCompanions
importing Companions.ContainerCompanions
importing Companions.SizerCompanions



这时出现错误:
'module' object has no attribute 'NotebookSizer'