Error: ImportError: cannot import name 'AsyncKernelManager' from 'jupyter_client`

[jonah-juul]

Error recently appeared past 48 hours. Wondering if anyone has run into this before and knows what root cause could be. Occurs right after pm.execute_notebook.

Using Docker container FROM jupyter/scipy-notebook:latest

Executing:   0%|                                                                                                                                                         | 0/8 [00:00<?, ?cell/s]
Traceback (most recent call last):
  File "/opt/conda/lib/python3.7/site-packages/traitlets/traitlets.py", line 528, in get
    value = obj._trait_values[self.name]
KeyError: 'kernel_manager_class'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/conda/lib/python3.7/site-packages/papermill/execute.py", line 104, in execute_notebook
    **engine_kwargs
  File "/opt/conda/lib/python3.7/site-packages/papermill/engines.py", line 49, in execute_notebook_with_engine
    return self.get_engine(engine_name).execute_notebook(nb, kernel_name, **kwargs)
  File "/opt/conda/lib/python3.7/site-packages/papermill/engines.py", line 343, in execute_notebook
    cls.execute_managed_notebook(nb_man, kernel_name, log_output=log_output, **kwargs)
  File "/opt/conda/lib/python3.7/site-packages/papermill/engines.py", line 402, in execute_managed_notebook
    return PapermillNotebookClient(nb_man, **final_kwargs).execute()
  File "/opt/conda/lib/python3.7/site-packages/papermill/clientwrap.py", line 36, in execute
    with self.setup_kernel(**kwargs):
  File "/opt/conda/lib/python3.7/contextlib.py", line 112, in __enter__
    return next(self.gen)
  File "/opt/conda/lib/python3.7/site-packages/nbclient/client.py", line 401, in setup_kernel
    self.start_kernel_manager()
  File "/opt/conda/lib/python3.7/site-packages/nbclient/client.py", line 328, in start_kernel_manager
    self.km = self.kernel_manager_class(kernel_name=self.kernel_name, config=self.config)
  File "/opt/conda/lib/python3.7/site-packages/traitlets/traitlets.py", line 556, in __get__
    return self.get(obj, cls)
  File "/opt/conda/lib/python3.7/site-packages/traitlets/traitlets.py", line 535, in get
    value = self._validate(obj, dynamic_default())
  File "/opt/conda/lib/python3.7/site-packages/nbclient/client.py", line 240, in _kernel_manager_class_default
    from jupyter_client import AsyncKernelManager
ImportError: cannot import name 'AsyncKernelManager' from 'jupyter_client' (/opt/conda/lib/python3.7/site-packages/jupyter_client/__init__.py)

[jonah-juul]

Found error - update to jupyter-client, pegging it to jupyter-client==6.1.2 fixes

[MSeal]

Yes the dependency chain is a little tighter for the most recent updates on upstream tools. >=6.1.2 should be sufficient and stable now

[mansiparashar]

Hey, updating isn't fixing the error either

[MSeal]

Check your jupyter package versions, and make sure you're running in the environment you think you are.

python -c "from jupyter_client import AsyncKernelManager" is a test for if this issue should be occurring.

[ttpro1995]

Update jupyter-client work for me

pip install -U jupyter-client

[onepunchmate]

Found error - update to jupyter-client, pegging it to jupyter-client==6.1.2

Hey, I just encountered a similar problem. do you mind elaborate on this part coz I am quite new to python... I have no idea how to do the pegging step.

[ManPython]

Found error - update to jupyter-client, pegging it to jupyter-client==6.1.2

Hey, I just encountered a similar problem. do you mind elaborate on this part coz I am quite new to python... I have no idea how to do the pegging step.

Get this as pip install jupyter-client==6.1.2 but take note around some possible conflict.

Requirement already satisfied: ipython-genutils in .p37/lib/python3.7/site-packages (from traitlets->jupyter-client==6.1.2) (0.2.0)
Installing collected packages: jupyter-client
  Attempting uninstall: jupyter-client
    Found existing installation: jupyter-client 6.1.12
    Uninstalling jupyter-client-6.1.12:
      Successfully uninstalled jupyter-client-6.1.12
ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
nbclient 0.5.3 requires jupyter-client>=6.1.5, but you have jupyter-client 6.1.2 which is incompatible.
Successfully installed jupyter-client-6.1.2