Traceback (most recent call last):
  File "/Users/alan/src/kezy182/.tox/docs/lib/python3.6/site-packages/sphinx/config.py", line 319, in eval_config_file
    execfile_(filename, namespace)
  File "/Users/alan/src/kezy182/.tox/docs/lib/python3.6/site-packages/sphinx/util/pycompat.py", line 88, in execfile_
    exec(code, _globals)
  File "/Users/alan/src/kezy182/docs/conf.py", line 31, in <module>
    django.setup()
  File "/Users/alan/src/kezy182/.tox/docs/lib/python3.6/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/Users/alan/src/kezy182/.tox/docs/lib/python3.6/site-packages/django/apps/registry.py", line 114, in populate
    app_config.import_models()
  File "/Users/alan/src/kezy182/.tox/docs/lib/python3.6/site-packages/django/apps/config.py", line 211, in import_models
    self.models_module = import_module(models_module_name)
  File "/Users/ac45/.pyenv/versions/3.6.10/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/Users/alan/src/kezy182/.tox/docs/lib/python3.6/site-packages/polymorphic/models.py", line 17, in <module>
    from .base import PolymorphicModelBase
  File "/Users/alan/src/kezy182/.tox/docs/lib/python3.6/site-packages/polymorphic/base.py", line 18, in <module>
    from .managers import PolymorphicManager
  File "/Users/alan/src/kezy182/.tox/docs/lib/python3.6/site-packages/polymorphic/managers.py", line 10, in <module>
    from polymorphic.query import PolymorphicQuerySet
  File "/Users/alan/src/kezy182/.tox/docs/lib/python3.6/site-packages/polymorphic/query.py", line 11, in <module>
    from django.db.models import FieldDoesNotExist
ImportError: cannot import name 'FieldDoesNotExist'