I looked at your task log on the github issue. It seems the main issue is that your notebook is Not stored as python code. Are you running it on jupyter notebook or is it ipython that you are runnig it on? Is this reproducible? If so what's the jupyter version, python and OS versions?
I could get rid of the error message not by adding
!pip install jupyter
But now the task starts and never finishes. I think it's because it starts a Jupyter Kernel in ClearML instead of just executing the code in my Notebook. Is there any configuration to tell ClearML it should just execute the code of the notebook remotely?