Traceback (most recent call last):


 "<stdin>", line 1, in <module>


 "/usr/lib/python2.7/site-packages/delegator.py", line 173, in send

self.subprocess.send_signal(s)
AttributeError: 'PopenSpawn' object has no attribute 'send_signal'

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'
