12

I was recently using Jupyter lab and decided to update my pandas version from 1.2 to the latest (1.4). So I ran 'conda update pandas' which seemed to work fine. However when I then launched Jupyter lab in the usual way 'jupyter lab' and tried to open the workbook I had just been working on I got the below error:

Unreadable Notebook: C:\Users...\script.ipynb TypeError("init() got an unexpected keyword argument 'capture_validation_error'")

I am getting this same error when trying to open any of my .ipynb files that were previously working fine. I can also open them fine in jupyter notebook, but for some reason they don't work in Jupyter lab anymore. Any idea how I can fix this?

Thanks

Yudkowsky90
  • 135
  • 1
  • 5
  • Open your notebook up in a text editor and check what value it has listed in the metadata for `nbformat`. Then check what version of `nbformat` is installed in your environment (`pip list` etc). – Riley Mar 20 '22 at 10:03
  • When I open up the notebook in an editor it has "nbformat": 4, "nbformat_minor": 5. The version installed in my environment is nbformat 5.1.3. What should I do next? – Yudkowsky90 Mar 21 '22 at 09:46
  • maybe downgrade nbformat to version 4? Or perhaps try a fresh environment. Can't help think there's a dependency mismatch between nbformat and jupyterlab. – Riley Mar 21 '22 at 10:25
  • I am having this issue today. Created a fresh environment in Anaconda, installed pandas, matplotlib, scikitlearn, bokeh, seaborn and JupyterLab. Cannot open existing notebooks or create new ones. – user14434091 Jun 15 '22 at 00:21

2 Answers2

10

It turns out that a recent update to jupyter_server>=1.15.0 broke compatibility with nbformat<5.2.0, but did not update the conda recipe correctly per this Github pull request.

It is possible that while updating pandas, you may have inadvertently also updated jupyterlab and/or jupyter_server.

While we wait for the build with the merged PR to come downstream, we can fix this dependency issue by updating nbformat manually with

conda install -c conda-forge nbformat

to get the newest version of nbformat with version >=5.2.

snowyrobot
  • 124
  • 1
  • 4
1

I had the same issue. I had installed jupyterlab using conda.

conda install -c conda-forge jupyterlab

and I could not open any notebook (old ones as newly created). What fixed my issue was to uninstall jupyterlab and jupyter and then reinstall jupyter lab.

conda remove jupyterlab
conda remove jupyter
conda install -c conda-forge jupyterlab
Ben2209
  • 1,071
  • 4
  • 11
  • 24