ERROR: Could not find a version that satisfies the requirement attrs<20.3,>=19.3 (from hass-nabucasa)

DEBUG:homeassistant.components.http.auth:Authenticated 127.0.0.1 for /media/local/test.mp3 using bearer token
DEBUG:homeassistant.components.http.view:Serving /media/local/test.mp3 to 127.0.0.1 (auth: True)
ERROR:aiohttp.server:Unhandled exception
Traceback (most recent call last):
  File "/nix/store/8y4x6km9q2ik0hcgh0klx6rl46pcw6qf-python3.8-aiohttp-3.7.3/lib/python3.8/site-packages/aiohttp/web_protocol.py", line 485, in start
    resp, reset = await task
  File "/nix/store/8y4x6km9q2ik0hcgh0klx6rl46pcw6qf-python3.8-aiohttp-3.7.3/lib/python3.8/site-packages/aiohttp/web_protocol.py", line 440, in _handle_request
    reset = await self.finish_response(request, resp, start_time)
  File "/nix/store/8y4x6km9q2ik0hcgh0klx6rl46pcw6qf-python3.8-aiohttp-3.7.3/lib/python3.8/site-packages/aiohttp/web_protocol.py", line 591, in finish_response
    await prepare_meth(request)
  File "/nix/store/8y4x6km9q2ik0hcgh0klx6rl46pcw6qf-python3.8-aiohttp-3.7.3/lib/python3.8/site-packages/aiohttp/web_fileresponse.py", line 241, in prepare
    return await self._sendfile(request, fobj, offset, count)
  File "/nix/store/8y4x6km9q2ik0hcgh0klx6rl46pcw6qf-python3.8-aiohttp-3.7.3/lib/python3.8/site-packages/aiohttp/web_fileresponse.py", line 96, in _sendfile
    await loop.sendfile(transport, fobj, offset, count)
  File "/nix/store/i9lzacdfrwlj1ayw551c016s0fq71p7j-python3-3.8.6/lib/python3.8/asyncio/base_events.py", line 1120, in sendfile
    return await self._sendfile_native(transport, file,
  File "/nix/store/i9lzacdfrwlj1ayw551c016s0fq71p7j-python3-3.8.6/lib/python3.8/asyncio/selector_events.py", line 578, in _sendfile_native
    return await self.sock_sendfile(transp._sock, file, offset, count,
  File "/nix/store/i9lzacdfrwlj1ayw551c016s0fq71p7j-python3-3.8.6/lib/python3.8/asyncio/base_events.py", line 836, in sock_sendfile
    self._check_sendfile_params(sock, file, offset, count)
  File "/nix/store/i9lzacdfrwlj1ayw551c016s0fq71p7j-python3-3.8.6/lib/python3.8/asyncio/base_events.py", line 889, in _check_sendfile_params
    raise ValueError(
ValueError: count must be a positive integer (got 0)