Hello,

I see you have a child theme active and an old version of theme. Please update theme first to it’s latest version 2.4. Update Visual Composer as well (install the included in theme version, read this article for guidance).
Then go to file includes/core/codeless_elements.php and find these lines:

vc_remove_element("vc_tta_accordion");
vc_remove_element("vc_tta_tour");
vc_remove_element("vc_tta_tabs");

Replace with these:

//vc_remove_element("vc_tta_accordion");
//vc_remove_element("vc_tta_tour");
//vc_remove_element("vc_tta_tabs");

Always use the included elements.
Let us know.

Best regards!