>>> "JK" == John Kitchin <jkitchin@andrew.cmu.edu> writes:

> I would see if you can open a jupyter notebook and start a notebook with
> the mat lab kernel. If not, it either isn’t installed, or maybe is
> installed in a different jupyter.

> If you get errors here, the issue is outside of org mode. For example, the
> hylang kernel quit working for me a while ago.

> See
> https://github.com/Calysto/matlab_kernel#kernel-times-out-while-starting
> for some troubleshooting tips.

It turned out that I need to install
pip3 install --user numpy
pip3 install --user pymatbridge

Where pip3 is the MaCOS 10.15 version

Now everything is fine.

Thanks 

Uwe