Run the ChromeDriver that's bundled with with tutorial:
npx chromedriver --port=4444 --url-base=/wd/hub
This will run ChromeDriver on localhost and on port 4444
If the bundled ChromeDriver isn't compatible with the version of Chrome installed on your machine, then please download the correct ChromeDriver version from the ChromeDriver downloads page. Here are some additional resources from the internet that'll help you: