Migrated and customzing broke

The code I get when I click “customize:”

Fatal error: Uncaught Error: Class ‘WP_Metadata_Lazyloader’ not found in /home/customer/www/theroofremedy.com/public_html/wp-includes/meta.php:1103 Stack trace: #0 /home/customer/www/theroofremedy.com/public_html/wp-includes/post.php(7220): wp_metadata_lazyloader() #1 /home/customer/www/theroofremedy.com/public_html/wp-includes/class-wp-query.php(3211): wp_queue_posts_for_term_meta_lazyload(Array) #2 /home/customer/www/theroofremedy.com/public_html/wp-includes/class-wp-query.php(3448): WP_Query->get_posts() #3 /home/customer/www/theroofremedy.com/public_html/wp-includes/post.php(2053): WP_Query->query(Array) #4 /home/customer/www/theroofremedy.com/public_html/wp-includes/nav-menu.php(698): get_posts(Array) #5 /home/customer/www/theroofremedy.com/public_html/wp-includes/class-wp-customize-nav-menus.php(797): wp_get_nav_menu_items(Object(WP_Term)) #6 /home/customer/www/theroofremedy.com/public_html/wp-includes/class-wp-hook.php(287): WP_Customize_Nav_Menus->customize_register(Object(WP_Customize_Manager)) #7 /home/customer/ in /home/customer/www/theroofremedy.com/public_html/wp-includes/meta.php on line 1103

The page I need help with: [log in to see the link]