text: Title: [ERROR] asyncio.exceptions.CancelledError
  Body: The program throws an error at runtime, how can this error be solved?
  ```python
  [ERROR] [2022-06-27 14:13:51,391:asyncio.events] 
  Traceback (most recent call last):
    File "/home/xumaoyuan/.virtualenvs/lib/python3.8/site-packages/distributed/utils.py", line 761, in wrapper
      return await func(*args, **kwargs)
    File "/home/xumaoyuan/.virtualenvs/lib/python3.8/site-packages/distributed/client.py", line 1400, in _handle_report
      await self._reconnect()
    File "/home/xumaoyuan/.virtualenvs/lib/python3.8/site-packages/distributed/utils.py", line 761, in wrapper
      return await func(*args, **kwargs)
    File "/home/xumaoyuan/.virtualenvs/lib/python3.8/site-packages/distributed/client.py", line 1211, in _reconnect
      await self._ensure_connected(timeout=timeout)
    File "/home/xumaoyuan/.virtualenvs/lib/python3.8/site-packages/distributed/client.py", line 1241, in _ensure_connected
      comm = await connect(
    File "/home/xumaoyuan/.virtualenvs/lib/python3.8/site-packages/distributed/comm/core.py", line 313, in connect
      await asyncio.sleep(backoff)
    File "/usr/lib/python3.8/asyncio/tasks.py", line 659, in sleep
      return await future
  asyncio.exceptions.CancelledError
  ```
  