Error in compile time, no module named workbench

./i18n-pull.sh
Pulling strings from Transifex...
Pulling conf/locale/config.yaml:locales from Transifex...
Pulling translations for resource edx-platform.openassessment (source: conf/locale/en/LC_MESSAGES/django.po)
Skipping 'ru' translation (file: conf/locale/ru/LC_MESSAGES/django.po).
Pulling translations for resource edx-platform.openassessment-js (source: conf/locale/en/LC_MESSAGES/djangojs.po)
Skipping 'ru' translation (file: conf/locale/ru/LC_MESSAGES/djangojs.po).
Done.
Validating strings...
Compiling strings...
Compile strings? [y/n]   y
Traceback (most recent call last):
  File "manage.py", line 21, in <module>
    execute_from_command_line(sys.argv)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 354, in execute_from_command_line
    utility.execute()
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 328, in execute
    django.setup()
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/__init__.py", line 18, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/apps/registry.py", line 85, in populate
    app_config = AppConfig.create(entry)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/apps/config.py", line 86, in create
    module = import_module(entry)
  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
ImportError: No module named workbench

Start with i18n-pull.sh and manage.py, then follow the traceback through Django setup to the INSTALLED_APPS entry that imports workbench. Reproduce the compile step and verify that strings compile without the ImportError.