Traceback (most recent call last):


 "/usr/lib/python3/dist-packages/spyder/widgets/helperwidgets.py", line 127, in paint

textRect = style.subElementRect(QStyle.SE_ItemViewItemText, options)
TypeError: subElementRect(self, QStyle.SubElement, QStyleOption, QWidget): not enough arguments

Traceback (most recent call last):


 "/opt/anaconda3/lib/python3.8/site-packages/tornado/ioloop.py", line 743, in _run_callback

ret = callback()


 "/opt/anaconda3/lib/python3.8/site-packages/tornado/ioloop.py", line 767, in _discard_future_result

future.result()


 "/opt/anaconda3/lib/python3.8/site-packages/distributed/nanny.py", line 443, in _on_exit

await self.scheduler.unregister(address=self.worker_address)


 "/opt/anaconda3/lib/python3.8/site-packages/distributed/core.py", line 861, in send_recv_from_rpc

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


 "/opt/anaconda3/lib/python3.8/site-packages/distributed/core.py", line 660, in send_recv

raise exc.with_traceback(tb)


 "/opt/anaconda3/lib/python3.8/site-packages/distributed/core.py", line 513, in handle_comm

result = await result


 "/opt/anaconda3/lib/python3.8/site-packages/distributed/scheduler.py", line 2208, in remove_worker

address = self.coerce_address(address)


 "/opt/anaconda3/lib/python3.8/site-packages/distributed/scheduler.py", line 4946, in coerce_address

raise TypeError("addresses should be strings or tuples, got %r" % (addr,))
TypeError: addresses should be strings or tuples, got None
