ImportError: Nenhum módulo chamado jinja2

Usando o tutorial do google-app-engine, recebi a seguinte mensagem de pilha de erros:

Traceback (most recent call last):
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\runtime\wsgi.py", line 239, in Handle
handler = _config_handle.add_wsgi_middleware(self._LoadHandler())
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\runtime\wsgi.py", line 298, in _LoadHandler
handler, path, err = LoadObject(self._handler)
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\runtime\wsgi.py", line 84, in LoadObject
obj = __import__(path[0])
File "D:\Dev\SandBoxes\web\omaha\omaha.py", line 4, in <module>
import jinja2
ImportError: No module named jinja2

Mesmo que eu tenha declarado isso nas bibliotecas do app.yaml:

application: ***
version: 1
runtime: python27
api_version: 1
threadsafe: true

libraries:
- name: jinja2
  version: latest
- name: webapp2
  version: latest


handlers:
- url: /css
  static_dir: css
- url: /js
  static_dir: js
- url: /img
  static_dir: img
- url: /.*
  script: omaha.application

Alguém teve um problema similar?

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