docker-websauna app error

gistfile1.txt

app      | Error processing line 1 of /usr/local/lib/python3.5/site-packages/websauna-nspkg.pth:
app      | 
app      |   Traceback (most recent call last):
app      |     File "/usr/local/lib/python3.5/site.py", line 167, in addpackage
app      |       exec(line)
app      |     File "<string>", line 1, in <module>
app      |     File "<frozen importlib._bootstrap>", line 574, in module_from_spec
app      |   AttributeError: 'NoneType' object has no attribute 'loader'
app      | 
app      | Remainder of file ignored
app      | Traceback (most recent call last):
app      |   File "/usr/local/bin/ws-alembic", line 6, in <module>
app      |     from pkg_resources import load_entry_point
app      |   File "/usr/local/lib/python3.5/site-packages/pkg_resources/__init__.py", line 3086, in <module>
app      |     @_call_aside
app      |   File "/usr/local/lib/python3.5/site-packages/pkg_resources/__init__.py", line 3070, in _call_aside
app      |     f(*args, **kwargs)
app      |   File "/usr/local/lib/python3.5/site-packages/pkg_resources/__init__.py", line 3099, in _initialize_master_working_set
app      |     working_set = WorkingSet._build_master()
app      |   File "/usr/local/lib/python3.5/site-packages/pkg_resources/__init__.py", line 574, in _build_master
app      |     ws.require(__requires__)
app      |   File "/usr/local/lib/python3.5/site-packages/pkg_resources/__init__.py", line 892, in require
app      |     needed = self.resolve(parse_requirements(requirements))
app      |   File "/usr/local/lib/python3.5/site-packages/pkg_resources/__init__.py", line 778, in resolve
app      |     raise DistributionNotFound(req, requirers)
app      | pkg_resources.DistributionNotFound: The 'websauna' distribution was not found and is required by the application
app exited with code 1