In the javascript specified for package-file.js towards the end of Ch. 5:
Typo:
"name": "Onboaring API",
Typo: it appears that a .yaml file should be specified, but .json file is instead:
OnboardingAPI.json
Until this point, only .yaml files are used for specifying the Onboard API ALPS and there seem to be no other instances of OnboardingAPI.json in the PDF.