Hello, @Kevin,
But that plugin is not part of our theme, it seems you have used some element or code of that plugin using our theme. Please try to reupdate the theme and check back and if the issue will still persists then please share the site WP Admin URL and Credentials and also the Cpanel Login details as well, as listed below, in the private content area of this topic, so that I will further check it for you and help you out if possible.
WP Admin URL:
WP Admin Username:
WP Admin Password:
Cpanel Admin URL:
Cpanel Admin Username:
Cpanel Admin Password:
Regards 8Themes Team.