How to understand the error when executing a python script?

Question

Chromium Embedded Framework

Trying to do a CEF build but got stuck in the early stages of installation. I activate the script, it runs for several minutes, even downloading something, but then the command line window just disappears. And I can't figure out what's wrong. I put all sorts of pauses, etc., which I could find in tips on the internet, but the window still closes at some stage. How can I write down a certain execution log or something? Or is it normal to stop the window on error?

set GN_DEFINES=is_component_build=true
# Use vs2017 or vs2019 as appropriate.
set GN_ARGUMENTS=--ide=vs2019 --sln=cef --filters=//cef/*
python ..\automate\automate-git.py --download-dir=e:\code\chromium_git --depot-tools-dir=e:\code\depot_tools --no-distrib --no-build
pause
CMD /Q /K
start "title" call abcd.exe param1 param2  
start "title" call xyz.exe param1 param2