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I completely forgot to cover composer manager in the Video.... I missed that. You are probably missing the NetPhp PHP classes:

https://packagist.org/packages/drupalonwindows/netphp

These should be pulled in automatically when you build Drupal 8.

Drupal 8 requires you to go through a build process in order to pull composer dependencies declared by contrib modules and core itself.

You can find instructions on that here:

https://www.drupal.org/node/2405811

Once you have set it up you can run custom composer commands such as "composer drupal-update" or "composer drupal-rebuild" to pull these dependencies.