Traceback (most recent call last):

 "<stdin>", line 1, in <module>AttributeError: 'NoneType' object has no attribute 'text'
Traceback (most recent call last):


 "/home/ma/miniconda3/lib/python3.7/site-packages/tornado/ioloop.py", line 743, in _run_callback

ret = callback()


 "/home/ma/miniconda3/lib/python3.7/site-packages/tornado/ioloop.py", line 767, in _discard_future_result

future.result()


 "/home/ma/miniconda3/lib/python3.7/site-packages/distributed/client.py", line 1141, in _update_scheduler_info

self._scheduler_identity = await self.scheduler.identity()


 "/home/ma/miniconda3/lib/python3.7/site-packages/distributed/core.py", line 806, in send_recv_from_rpc

result = await send_recv(comm=comm, op=key, **kwargs)


 "/home/ma/miniconda3/lib/python3.7/site-packages/distributed/core.py", line 589, in send_recv

response = await comm.read(deserializers=deserializers)


 "/home/ma/miniconda3/lib/python3.7/site-packages/distributed/comm/tcp.py", line 184, in read

n_frames = await stream.read_bytes(8)


 "/home/ma/miniconda3/lib/python3.7/site-packages/tornado/iostream.py", line 436, in read_bytes

future = self._start_read()


 "/home/ma/miniconda3/lib/python3.7/site-packages/tornado/iostream.py", line 824, in _start_read

assert self._read_future is None, "Already reading"
AssertionError: Already reading
