pipeline.jinja2: pipeline is not a package

[jesusch]

installed software

python 3.7.3
Django                   1.11.23    
django-appconf           1.0.3      
django-compressor        2.3        
django-jinja             2.4.1      
django-pipeline          1.6.14     
django-redis             4.10.0

settings.py:

INSTALLED_APPS = ( ..., 'pipeline', )

TEMPLATES = [
    {
        'BACKEND': 'django_jinja.backend.Jinja2',
        'DIRS': [  os.path.join(BASE_DIR, 'templates/'),],
        'APP_DIRS': True,
        'OPTIONS': {
            "match_extension": ".html",
            'context_processors': [...],
            'extensions':  [ 'pipeline.jinja2.PipelineExtension', ],
        },
    },
]

throws the following error:

Traceback:

File "/Users/jesusch/git/tvs-frontend/venv/lib/python3.7/site-packages/django/template/utils.py" in __getitem__
  65.             return self._engines[alias]

During handling of the above exception (module 'pipeline' has no attribute '__path__'), another exception occurred:

File "/Users/jesusch/git/tvs-frontend/venv/lib/python3.7/site-packages/django/core/handlers/exception.py" in inner
  41.             response = get_response(request)

File "/Users/jesusch/git/tvs-frontend/venv/lib/python3.7/site-packages/django/core/handlers/base.py" in _legacy_get_response
  249.             response = self._get_response(request)

File "/Users/jesusch/git/tvs-frontend/venv/lib/python3.7/site-packages/django/core/handlers/base.py" in _get_response
  187.                 response = self.process_exception_by_middleware(e, request)

File "/Users/jesusch/git/tvs-frontend/venv/lib/python3.7/site-packages/django/core/handlers/base.py" in _get_response
  185.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/Users/jesusch/git/tvs-frontend/venv/lib/python3.7/site-packages/django/views/decorators/debug.py" in sensitive_post_parameters_wrapper
  76.             return view(request, *args, **kwargs)

File "/Users/jesusch/git/tvs-frontend/venv/lib/python3.7/site-packages/django/utils/decorators.py" in _wrapped_view
  149.                     response = view_func(request, *args, **kwargs)

File "/Users/jesusch/git/tvs-frontend/venv/lib/python3.7/site-packages/django/views/decorators/cache.py" in _wrapped_view_func
  57.         response = view_func(request, *args, **kwargs)

File "/Users/jesusch/git/tvs-frontend/tvsquared/user/views/login.py" in login
  116.         response = render(request, 'user/login.html', {'form': form, 'next': redirect_to, 'hashpath': hashpath, 'unlockTime': unlockTime})

File "/Users/jesusch/git/tvs-frontend/venv/lib/python3.7/site-packages/django/shortcuts.py" in render
  30.     content = loader.render_to_string(template_name, context, request, using=using)

File "/Users/jesusch/git/tvs-frontend/venv/lib/python3.7/site-packages/django/template/loader.py" in render_to_string
  67.         template = get_template(template_name, using=using)

File "/Users/jesusch/git/tvs-frontend/venv/lib/python3.7/site-packages/django/template/loader.py" in get_template
  18.     engines = _engine_list(using)

File "/Users/jesusch/git/tvs-frontend/venv/lib/python3.7/site-packages/django/template/loader.py" in _engine_list
  72.     return engines.all() if using is None else [engines[using]]

File "/Users/jesusch/git/tvs-frontend/venv/lib/python3.7/site-packages/django/template/utils.py" in all
  89.         return [self[alias] for alias in self]

File "/Users/jesusch/git/tvs-frontend/venv/lib/python3.7/site-packages/django/template/utils.py" in <listcomp>
  89.         return [self[alias] for alias in self]

File "/Users/jesusch/git/tvs-frontend/venv/lib/python3.7/site-packages/django/template/utils.py" in __getitem__
  80.             engine = engine_cls(params)

File "/Users/jesusch/git/tvs-frontend/venv/lib/python3.7/site-packages/django_jinja/backend.py" in __init__
  188.         self.env = environment_cls(**options)

File "/Users/jesusch/git/tvs-frontend/venv/lib/python3.7/site-packages/jinja2/environment.py" in __init__
  333.         self.extensions = load_extensions(self, extensions)

File "/Users/jesusch/git/tvs-frontend/venv/lib/python3.7/site-packages/jinja2/environment.py" in load_extensions
  85.             extension = import_string(extension)

File "/Users/jesusch/git/tvs-frontend/venv/lib/python3.7/site-packages/jinja2/utils.py" in import_string
  143.         return getattr(__import__(module, None, None, [obj]), obj)

Exception Type: ModuleNotFoundError at /u/login/
Exception Value: No module named 'pipeline.jinja2'; 'pipeline' is not a package