Error handling
1 if can not location python version
error: can not find Python specified in RETICULATE_PYTHON (/Library/Frameworks/Python.framework/Versions/3.12/bin/python3)
1.1 find current python version
which -a python python3
1.2 change python version in .Renviron
under home folder
go to home folder by Command-Shift-H
RETICULATE_PYTHON="/Library/Frameworks/Python.framework/Versions/3.13/bin/python3"