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Jupyter Lab 4.0.2

When I try to save and export notebook as HTML or any other format I get a 404 error. Below is the output in from Anaconda Prompt.

[W 2023-08-04 11:47:19.166 ServerApp] 404 GET /nbconvert/HTML_NoInput/RTC%3ATest.ipynb?download=true (::1): No such file or directory: RTC:Test.ipynb
[W 2023-08-04 11:47:19.169 ServerApp] 404 GET /nbconvert/HTML_NoInput/RTC%3ATest.ipynb?download=true (0043a24c16a345a9a677f3d39b54e503@::1) 203.16ms referer=http://localhost:8888/lab/tree/RTC%3ATest.ipynb

I have tried removing and reinstalling nbconvert but no luck. It seems to suggest that the notebook does not exist. I have tried on various notebooks stored in different file locations but I have the same issue. Any help anyone could offer would be greatly appreciated.

toyota Supra
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Alex Griffiths
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  • What is the name of your notebook? The error message suggests it is `RTC:Test`, with a colon `:` character. This can cause problems, you could try renaming the notebook to `RTCTest` for example. – Marijn Aug 05 '23 at 13:46
  • Hi Marijn, thanks for your reply. The notebook is just called "Test" The RTC: seems to be something Jupyter is adding on. I believe this is related to the Real Time collaboration feature that was included in Jupyter 4 release but I am not 100% sure. – Alex Griffiths Aug 08 '23 at 09:44
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    Yup, RTC breaks the download feature, even when you disable the collab-mode (see also the respective issue in the RTC github: https://github.com/jupyterlab/jupyter-collaboration/issues/183). You can work around that issue by adding `--ServerApp.disable_check_xsrf=True` to the `c.Spawner.args` list and then manually deleting the "RTC:" from the URL when you get the 404 error. – Frederik Aug 29 '23 at 14:26
  • Oh, and also maybe watch https://github.com/jupyterlab/jupyter-collaboration/issues/151 and https://github.com/jupyter/nbconvert/issues/2031 – Frederik Aug 29 '23 at 14:54

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