rn-background-geolocation-demo: error on "$ npm run open"

RNBackgroundGeolocationSample@2.9.4 open /Users/xxxxx/projects/yyyyy babel-node scripts/openConsole.js

sh: babel-node: command not found npm ERR! file sh npm ERR! code ELIFECYCLE npm ERR! errno ENOENT npm ERR! syscall spawn npm ERR! RNBackgroundGeolocationSample@2.9.4 open: babel-node scripts/openConsole.js npm ERR! spawn ENOENT npm ERR! npm ERR! Failed at the RNBackgroundGeolocationSample@2.9.4 open script. npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in: npm ERR! /Users/xxxxx/.npm/_logs/2017-10-23T23_54_04_451Z-debug.log