It looks like pysar is identified as executable program, but not as python module yet. It could be because $PYTHONPATH variable is referenced before definition, please try to add the following to the beginning of your .cshrc file:
if ( ! $?PYTHONPATH ) then
setenv PYTHONPATH ""
endif
Or if you are using bash instead of csh/tcsh, add the following to the beginning of your .bashrc file:
if [ -z ${PYTHONPATH+x} ]; then export PYTHONPATH=""; fi
I have updated the README file in the website according to this also, for the reference.
After save the file, please re-source it and run the command again. Don't hesitate to let me know if it still does not please.
Yunjun