Traceback (most recent call last):
  File "./backend/main.py", line 17, in <module>
    main()
  File "./backend/main.py", line 13, in main
    web.run_app(app)
  File "/usr/local/lib/python3.7/site-packages/aiohttp/web.py", line 433, in run_app
    reuse_port=reuse_port))
  File "/usr/local/lib/python3.7/asyncio/base_events.py", line 579, in run_until_complete
    return future.result()
  File "/usr/local/lib/python3.7/site-packages/aiohttp/web.py", line 305, in _run_app
    await runner.setup()
  File "/usr/local/lib/python3.7/site-packages/aiohttp/web_runner.py", line 232, in setup
    self._server = await self._make_server()
  File "/usr/local/lib/python3.7/site-packages/aiohttp/web_runner.py", line 331, in _make_server
    await self._app.startup()
  File "/usr/local/lib/python3.7/site-packages/aiohttp/web_app.py", line 389, in startup
    await self.on_startup.send(self)
  File "/usr/local/lib/python3.7/site-packages/aiohttp/signals.py", line 34, in send
    await receiver(*args, **kwargs)  # type: ignore
  File "/pathfinder/backend/application.py", line 11, in on_startup
    app.redis = await aioredis.create_redis_pool(app.config.REDIS_URL, encoding='utf-8')
  File "/usr/local/lib/python3.7/site-packages/aioredis/commands/__init__.py", line 198, in create_redis_pool
    loop=loop)
  File "/usr/local/lib/python3.7/site-packages/aioredis/pool.py", line 56, in create_pool
    await pool._fill_free(override_min=False)
  File "/usr/local/lib/python3.7/site-packages/aioredis/pool.py", line 383, in _fill_free
    conn = await self._create_new_connection(self._address)
  File "/usr/local/lib/python3.7/site-packages/aioredis/connection.py", line 108, in create_connection
    timeout, loop=loop)
  File "/usr/local/lib/python3.7/asyncio/tasks.py", line 414, in wait_for
    return await fut
  File "/usr/local/lib/python3.7/site-packages/aioredis/stream.py", line 19, in open_connection
    lambda: protocol, host, port, **kwds)
  File "/usr/local/lib/python3.7/asyncio/base_events.py", line 905, in create_connection
    type=socket.SOCK_STREAM, proto=proto, flags=flags, loop=self)
  File "/usr/local/lib/python3.7/asyncio/base_events.py", line 1275, in _ensure_resolved
    proto=proto, flags=flags)
  File "/usr/local/lib/python3.7/asyncio/base_events.py", line 784, in getaddrinfo
    None, getaddr_func, host, port, family, type, proto, flags)
  File "/usr/local/lib/python3.7/concurrent/futures/thread.py", line 57, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/usr/local/lib/python3.7/socket.py", line 748, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -2] Name or service not known
Unclosed client session
client_session: <aiohttp.client.ClientSession object at 0x7f04b0c203d0>