lost widget in header after wordpress

HI there , i tested the new wordpress update and enfold update on a staging area (not on the live site yet, would like to resolve this issue first, site just went live a few days ago and i would like to keep the client happy )
everything is OK except for i lost the header widget area that i had done using this custom code from the forum : add_action( ‘ava_after_main_menu’, ‘enfold_customization_header_widget_area’ );
function enfold_customization_header_widget_area() {
dynamic_sidebar( ‘header’ );
}
i have been using this in a child theme that was working before the update,