Я установил пинакс на windows

после попытки создать проект я получил эту ошибку:

(mysite) C:\virtualenvs\mysite>pinax-admin setup_project mypinax
Created project mypinax
Installing project requirements...
Traceback (most recent call last):
  File "c:\virtualenvs\mysite\Scripts\pinax-admin-script.py", line 8, in 
    load_entry_point('Pinax==0.9a2', 'console_scripts', 'pinax-admin')()
  File "c:\virtualenvs\mysite\lib\site-packages\pinax\core\management\__init__.py",
 line 105, in execute_from_command_line
    runner.execute()
  File "c:\virtualenvs\mysite\lib\site-packages\pinax\core\management\__init__.py",
 line 94, in execute
    self.loader.load(command).run_from_argv(argv)
  File "c:\virtualenvs\mysite\lib\site-packages\pinax\core\management\base.py", lin
e 45, in run_from_argv
    self.handle(*args, **options.__dict__)
  File "c:\virtualenvs\mysite\lib\site-packages\pinax\core\management\commands\setup_project.py", line 66, in handle
self.setup_project(args[0], options["base"], options)
  File "c:\virtualenvs\mysite\lib\site-packages\pinax\core\management\commands\setup_project.py", line 134, in setup_project
    installer.install_reqs(not options["allow_no_virtualenv"])
  File "c:\virtualenvs\mysite\lib\site-packages\pinax\core\management\commands\setup_project.py", line 207, in install_reqs
    pip.call_subprocess([
AttributeError: 'module' object has no attribute 'call_subprocess'

Буду благодарен за любую помощь. Кстати, я использую Python 2.7.3 и последнюю стабильную версию Pinax