Error Saving while using notebook

Hi, I am pulling the dolfinx latest version with

dolfinx/dolfinx:latest

But then I am not able to save my notebook as I am getting the following pop up box saying

Unexpected error while saving file:name.ipynb 'coroutine' object is not subscriptable

I tried using the stable version of Dolfinx, but then the Conjugate Gradient Iteration code is giving me errors.

Can you help me with this?
Thank you in advance