Made child theme, now showing: Fatal error: Call to undefined function siteorigin_setting()

Okay so I’ve been doing customisations to theme files on the vantage theme and decided, instead of having to reupload my changes everything there is a theme update I’d just put my css and function changes in a child theme instead. Made the child theme with the style.css which worked totally fine, then went to do functions.php which then broke the site which then showed up NOTHING on the site so I decided to copy the complete functions.php file from the vantage theme to vantage-child – still wasn’t working so I scrapped the child theme all together and went back to the original parent theme which now no longer works. I am getting this error:

Fatal error: Call to undefined function siteorigin_setting() in /home/skyrack/public_html/dev/lubecontrol/wp-content/themes/vantage/header.php on line 53

Before making the child theme I hadn’t done any changes to the header.php and now no settings options exist and the page is pretty much dead with exception of the first line. All the pages and backend are still there but the theme is no longer working.

Any thoughts? I am using premium version as well (not sure where to find the code).

URL: http://lubecontrol.dev.skyrack.com.au/