[WIP] Invalid Notebook There was an error rendering your Notebook: the 'state' key is missing from 'metadata.widgets'. Add 'state' to each, or remove 'metadata.widgets'. Using nbformat v5.10.4 and nbconvert v7.16.6

[Copilot]

• Explored repository structure and identified the problem
• Installed nbformat and nbconvert dependencies
• Reproduced the error with nbconvert failing on widget metadata
• Analyzed that generated notebooks lack widget metadata structure
• Identified that the fix needs to be in utils/generate_notebooks.py
• Updated build_notebook() function to include proper widget metadata structure
• Fixed existing problematic notebook course/ko/chapter1/section3.ipynb
• Verified all notebooks now pass nbconvert validation
• Tested that newly generated notebooks work correctly

Problem Fixed:
The issue was that notebook metadata was missing the required metadata.widgets["application/vnd.jupyter.widget-state+json"]["state"] structure that nbconvert expects. This caused nbconvert to fail with a KeyError when trying to render notebooks.

Changes Made:

1. utils/generate_notebooks.py: Added proper widget metadata structure with empty state object to all generated notebooks
2. course/ko/chapter1/section3.ipynb: Fixed existing notebook by wrapping widget entries under the required state key

Validation:

• All existing notebooks now pass nbconvert HTML conversion
• Newly generated notebooks include proper widget metadata structure
• No functional changes to notebook content or behavior

Original prompt

Invalid Notebook
There was an error rendering your Notebook: the 'state' key is missing from 'metadata.widgets'. Add 'state' to each, or remove 'metadata.widgets'.
Using nbformat v5.10.4 and nbconvert v7.16.6

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[braintrue]

Confirmed.