Fatal Error et_builder_setting_is_on()

I'm getting an error in my child theme.

Fatal error: Uncaught Error: Call to undefined function et_builder_setting_is_on() in /home/mysitefami/public_html/wp-content/themes/Divi/includes/builder/class-et-builder-element.php:1515 Stack trace: #0 /home/mysite/public_html/wp-content/themes/Divi/includes/builder/class-et-builder-element.php(793): ET_Builder_Element::setup_advanced_styles_manager() #1 /home/mysitefami/public_html/wp-content/themes/mysite-child/ds-custom-modules.php(645): ET_Builder_Element->__construct() #2 /home/mysitefami/public_html/wp-content/themes/mysite-child/functions.php(240): include('/home/mysitefami/...') #3 /home/mysitefami/public_html/wp-includes/class-wp-hook.php(307): DS_Custom_Modules(Object(WP)) #4 /home/mysitefami/public_html/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array) #5 /home/mysitefami/public_html/wp-includes/plugin.php(524): WP_Hook->do_action(Array) #6 /home/mysitefami/public_html/wp-includes/class-wp.php(787): do_action_ref_array('wp', Array) #7 /home/mysitefami/public_html/wp-includes/functions.php(1330): WP->main(' in /home/mysitefami/public_html/wp-content/themes/Divi/includes/builder/class-et-builder-element.php on line 1515

If I comment out the line below, the error goes away and everything works.

function DS_Custom_Modules(){
if(class_exists("ET_Builder_Module")){
// include("ds-custom-modules.php");
}
}

All plugins and themes are updated to the latest version.I've disabled all plugins and determined that the issue is the Divi theme.

Any ideas? I don't like commenting out code unless I know what it's for.