Dear Anil,
a couple of weeks ago, I had identical problem while tried to update FLUKA. Before, I got stacked with the problem to install required Fortan version. After the last update of the Fortran distribution, so latest versions can work with Intel chips and Monterey MacOS version this problem has resoled, but I suppose that my FLUKA environment got damaged by attempts to reinstall it.
As I understand, in my case this problem appeared when FLAIR starts using the Python interface library (tkinter) without Xming server.
In my case, it was because I use Anaconda Python installation, so some libraries are installed within this environment. I have resolved the issue by reinstallation of all required and suggested libraries, and reinstallation of Python libraries using “pip uninstall/install” (port install should also work) from the terminal, instead of “conda install” utilities.
Then I reinstalled geoviewer.
Cheers,
Illia