I’ve been using the Jupyter Hub 1.4 Docker image. I rebuilt and restarted the container a couple of days ago and now cannot spawn a session. I’m using the sudospawner.
The spawning process produces an “AttributeError: module ‘notebook.base.handlers’ has no attribute ‘IPythonHandler’” exception.
Full stack trace:
Traceback (most recent call last):
File "/usr/local/lib/python3.9/dist-packages/traitlets/utils/importstring.py", line 32, in import_item
pak = getattr(module, obj)
AttributeError: module 'notebook.base.handlers' has no attribute 'IPythonHandler'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/local/lib/python3.9/dist-packages/jupyterlab/labhubapp.py", line 19, in <module>
from jupyterhub.singleuser.mixins import make_singleuser_app
File "/usr/local/lib/python3.9/dist-packages/jupyterhub/singleuser/__init__.py", line 5, in <module>
from .app import main
File "/usr/local/lib/python3.9/dist-packages/jupyterhub/singleuser/app.py", line 41, in <module>
SingleUserNotebookApp = make_singleuser_app(App)
File "/usr/local/lib/python3.9/dist-packages/jupyterhub/singleuser/mixins.py", line 916, in make_singleuser_app
BaseHandler = _patch_app_base_handlers(empty_parent_app)
File "/usr/local/lib/python3.9/dist-packages/jupyterhub/singleuser/mixins.py", line 871, in _patch_app_base_handlers
base_handlers.append(import_item(base_handler_name))
File "/usr/local/lib/python3.9/dist-packages/traitlets/utils/importstring.py", line 34, in import_item
raise ImportError("No module named %s" % obj)
ImportError: No module named IPythonHandler
Has anyone else experienced this and know how to fix it?
I’ve tried later versions of the Jupyter Hub Docker image without success.
My question is also on StackOverflow.