Apparent bug: missed css in theme folder.

Hello.

When theme loads, apparently this theme loads non existing css:

https://www.nobainnogainfitness.com/wp-content/themes/themify-base/skins/style.css?ver=4.1

This file does not exist in the theme folder tree.
Theme version 1.1.3

Can you please fix this?

Thank you.
Konstantin.