Traceback (most recent call last):


 "/usr/local/lib/python3.7/asyncio/events.py", line 88, in _run

self._context.run(self._callback, *self._args)


 "/usr/local/lib/python3.7/site-packages/aiohttp/web_ws.py", line 102, in _send_heartbeat

self._loop.create_task(self._writer.ping())
# type: ignore
AttributeError: 'NoneType' object has no attribute 'ping'

Traceback (most recent call last):


 "/opt/conda/lib/python3.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2862, in _dep_map

return self.__dep_map


 "/opt/conda/lib/python3.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2669, in __getattr__

raise AttributeError(attr)
AttributeError: _DistInfoDistribution__dep_map
