Wordpress不具合を修正してほしいです

サーバー移管したら失敗したようで、 下記エラーメッセージが表示され、投稿の編集が出来なくなりました。 解決できる方に依頼したいです。 Fatal error: Uncaught Error: Call to undefined function get_registered_theme_features() in /home/xs157984/lolinowa.com/public_html/wp-includes/rest-api/endpoints/class-wp-rest-themes-controller.php:405 Stack trace: #0 /home/xs157984/lolinowa.com/public_html/wp-includes/rest-api/endpoints/class-wp-rest-controller.php(412): WP_REST_Themes_Controller->get_item_schema() #1 /home/xs157984/lolinowa.com/public_html/wp-includes/rest-api/endpoints/class-wp-rest-controller.php(367): WP_REST_Controller->get_context_param() #2 /home/xs157984/lolinowa.com/public_html/wp-includes/rest-api/endpoints/class-wp-rest-themes-controller.php(428): WP_REST_Controller->get_collection_params() #3 /home/xs157984/lolinowa.com/public_html/wp-includes/rest-api/endpoints/class-wp-rest-themes-controller.php(45): WP_REST_Themes_Controller->get_collection_params() #4 /home/xs157984/lolinowa.com/public_html/wp-includes/rest-api.php(280): WP_REST_Themes_Controller->register_routes() #5 /home/xs157984/lolinowa.com/public_html/wp-includes/class-wp-hook.php(2 in /home/xs157984/lolinowa.com/public_html/wp-includes/rest-api/endpoints/class-wp-rest-themes-controller.php on line 405