Jupyter Lab and Notebook Problem: Kernel Error

Question

It appears that somehow one of my kernels is deleted. And perhaps that\'s why I am getting this error. How could I possibly fix it? Can I reinstall something (the kernel in the

Answer 1

I was able to resolve the problem here

I installed jupyter_client 5.3.4 and jupyter_core 4.6.0 with this command

pip install jupyter_client --upgrade