errors when running site locally -- assets not found

[ultrasaurus]

not sure if these were intended to be removed or not yet included:

bundle exec jekyll serve

then visit http://127.0.0.1:4000/

console reports these errors

[2016-10-23 18:44:37] ERROR `/assets/header_image.jpg' not found.
[2016-10-23 18:44:38] ERROR `/assets/icons/favicon-16x16.png' not found.
[2016-10-23 18:44:38] ERROR `/assets/icons/favicon-96x96.png' not found.
[2016-10-23 18:44:38] ERROR `/assets/icons/favicon-32x32.png' not found.
[2016-10-23 18:44:38] ERROR `/assets/icons/android-icon-192x192.png' not found.
[2016-10-23 18:44:38] ERROR `/assets/icons/favicon.ico' not found.