Not able to open an of the ipynb files

It has been working. I tried today, around 2 pm CST. None of the notebook files open. I get the following error msg

"Unable to render code block"

Cleared my cache, tried with Edge and Chrome. Same error.

Please advise

Thanks

The issue does not name a notebook, file path, test, or repository entry point. Start by checking whether the repository's .ipynb files render consistently and whether the failure is specific to GitHub; compare with the reported Edge and Chrome behavior. Done means identifying a reproducible repository-side cause or documenting that the problem is external to the project.

Written by the indexing model from the issue text.