error message when opening notebooks

we have a collection of notebooks that we have been loading and working on jupyter lab and notebook. we are getting the following error when loading these notebooks on jupyter-hub.


the notebook itself has all the json data. this is one instance such an error:

https://github.com/miykael/nipype_tutorial/blob/3d12ca0b0d35351bfce42a5bf615f6188d7ebd55/notebooks/introduction_quickstart.ipynb

Start by opening the linked notebooks/introduction_quickstart.ipynb file and reproducing its load in JupyterHub. The issue names no repository file, test, or entry point beyond the notebook itself and provides the error only as an image. Done means identifying the cause of the loading error and verifying that the notebook opens successfully.

Written by the indexing model from the issue text.