Fatal error: Call to undefined function avia_get_option() – AFTER UPDATE

Hello i am having a problem after updating your theme. I am getting this on all pages:
Fatal error: Call to undefined function avia_get_option() in /home/cheneaugallery/public_html/wp-content/themes/enfold/header.php on line 7

I also do not have access to the “Visual” page editing inside of wordpress. It just has a bunch of text instead of having boxes with the website content inside them. I have already deactivated and reactivated all the pluggins… did not work. Please feel free to have a look and get back to me as soon as possible. Let me know if you need any more information.

Thanks.