Django south使用问题

大家好，

  按网上教程安装了south，使用manage shell也可以import south。在INSTALLED_APPS后加入south：
INSTALLED_APPS = (
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'blog',
    'south', 
)

再使用命令syncdb提示如下错误，请大家指导下原因，谢谢。

Traceback (most recent call last):
  File "C:\Users\zzzz\workspacejava\blog\manage.py", line 11, in <module>
    execute_from_command_line(sys.argv)
  File "C:\Python33\lib\site-packages\django\core\management\__init__.py", line 336, in execute_from_command_line
    utility.execute()
  File "C:\Python33\lib\site-packages\django\core\management\__init__.py", line 328, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "C:\Python33\lib\site-packages\django\core\management\base.py", line 357, in run_from_argv
    parser = self.create_parser(argv[0], argv[1])
  File "C:\Python33\lib\site-packages\django\core\management\base.py", line 306, in create_parser
    parser.add_option(opt)
  File "C:\Python33\lib\optparse.py", line 1012, in add_option
    self._check_conflict(option)
  File "C:\Python33\lib\optparse.py", line 987, in _check_conflict
    option)
optparse.OptionConflictError: option --verbosity: conflicting option string(s): --verbosity
Finished "C:\Users\zzzz\workspacejava\blog\manage.py syncdb" execution.