Hi Ishan,

The problem may be due to running macOS Catalina. I'm not sure that some of
the neuroimaging tools, such as dcm2nii, have support beyond Sierra or High
Sierra. If your machine can run another OS, I would try running this on
Sierra. If you can use a Docker container to run some of the steps that are
not Catalina-compatible and then run the MATLAB portion after that
pre-processing, you may be able to get by without installing a different OS
or licensing MATLAB on a virtual machine.

Cheers,
Paul