================================== FAILURES ===================================
_______________________________ test_gridsearch _______________________________

    def test_func():
---------------------------- Captured stderr call -----------------------------
distributed.scheduler - ERROR - Couldn't gather keys {'_score-4d2165fa-45ff-4705-90a5-5c464fb49b2a': [], '_score-d139b189-4b59-4823-a75e-76613308362a': [], '_score-2de29df9-0e9f-4d81-8032-4b41d918fb18': [], '_score-35f12ba1-3806-4b51-8307-a42da6d043ef': [], '_score-2dc00b23-6a1b-4312-8b97-a05a9d1c391c': [], '_score-fb91dd67-dee3-4e81-9bf6-1384f42bd993': []} state: [None, None, None, None, None, None] workers: []
NoneType: None
distributed.scheduler - ERROR - Workers don't have promised key: [], _score-4d2165fa-45ff-4705-90a5-5c464fb49b2a
NoneType: None
distributed.scheduler - ERROR - Workers don't have promised key: [], _score-d139b189-4b59-4823-a75e-76613308362a
NoneType: None
distributed.scheduler - ERROR - Workers don't have promised key: [], _score-2de29df9-0e9f-4d81-8032-4b41d918fb18
NoneType: None
distributed.scheduler - ERROR - Workers don't have promised key: [], _score-35f12ba1-3806-4b51-8307-a42da6d043ef
NoneType: None
distributed.scheduler - ERROR - Workers don't have promised key: [], _score-2dc00b23-6a1b-4312-8b97-a05a9d1c391c
NoneType: None
distributed.scheduler - ERROR - Workers don't have promised key: [], _score-fb91dd67-dee3-4e81-9bf6-1384f42bd993
NoneType: None
distributed.client - WARNING - Couldn't gather 6 keys, rescheduling {'_score-4d2165fa-45ff-4705-90a5-5c464fb49b2a': (), '_score-d139b189-4b59-4823-a75e-76613308362a': (), '_score-2de29df9-0e9f-4d81-8032-4b41d918fb18': (), '_score-35f12ba1-3806-4b51-8307-a42da6d043ef': (), '_score-2dc00b23-6a1b-4312-8b97-a05a9d1c391c': (), '_score-fb91dd67-dee3-4e81-9bf6-1384f42bd993': ()}
tornado.application - ERROR - Exception after Future was cancelled
Traceback (most recent call last):
  File "C:\Miniconda\envs\dask-ml-test\lib\site-packages\tornado\gen.py", line 742, in run
    yielded = self.gen.throw(*exc_info)  # type: ignore
  File "D:\a\1\s\tests\model_selection\test_incremental.py", line 405, in test_gridsearch
    yield search.fit(X, y, classes=[0, 1])
  File "C:\Miniconda\envs\dask-ml-test\lib\site-packages\tornado\gen.py", line 735, in run
    value = future.result()
  File "C:\Miniconda\envs\dask-ml-test\lib\site-packages\tornado\gen.py", line 742, in run
    yielded = self.gen.throw(*exc_info)  # type: ignore
  File "D:\a\1\s\dask_ml\model_selection\_incremental.py", line 625, in _fit
    prefix=self.prefix,
  File "C:\Miniconda\envs\dask-ml-test\lib\site-packages\tornado\gen.py", line 735, in run
    value = future.result()
  File "C:\Miniconda\envs\dask-ml-test\lib\site-packages\tornado\gen.py", line 742, in run
    yielded = self.gen.throw(*exc_info)  # type: ignore
  File "D:\a\1\s\dask_ml\model_selection\_incremental.py", line 297, in _fit
    scores = yield client.gather(scores)
  File "C:\Miniconda\envs\dask-ml-test\lib\site-packages\tornado\gen.py", line 735, in run
    value = future.result()
  File "C:\Miniconda\envs\dask-ml-test\lib\site-packages\distributed\client.py", line 1865, in _gather
    self._send_to_scheduler({"op": "report-key", "key": key})
  File "C:\Miniconda\envs\dask-ml-test\lib\site-packages\distributed\client.py", line 960, in _send_to_scheduler
    "Message: %s" % (self.status, msg)
Exception: Tried sending message after closing.  Status: closed
Message: {'op': 'report-key', 'key': '_score-4d2165fa-45ff-4705-90a5-5c464fb49b2a'}

distributed.scheduler - ERROR - Workers don't have promised key: [], _score-4d2165fa-45ff-4705-90a5-5c464fb49b2a