error message

and also on pay later when pay later isnt enabled

[18-Sep-2021 05:15:10 UTC] payment_method was called incorrectly. Order properties should not be accessed directly. Backtrace: do_action('wp_ajax_order_exporter'), WP_Hook->do_action, WP_Hook->apply_filters, WC_Order_Export_Admin->ajax_gate, WC_Order_Export_Pro_Ajax->ajax_run_one_job, WC_Order_Export_Engine::build_file_full, do_action('woe_order_exported'), WP_Hook->do_action, WP_Hook->apply_filters, WC_Order_Export_Engine::{closure}, WC_Order->update_status, WC_Order->save, WC_Order->status_transition, do_action('woocommerce_order_status_completed'), WP_Hook->do_action, WP_Hook->apply_filters, WC_Emails::send_transactional_email, do_action_ref_array('woocommerce_order_status_completed_notification'), WP_Hook->do_action, WP_Hook->apply_filters, WC_Email_Customer_Completed_Order->trigger, WC_Email->get_content, WC_Email_Customer_Completed_Order->get_content_html, wc_get_template_html, wc_get_template, include('/themes/fp-theme-prodog/woocommerce/emails/customer-completed-order.php'), do_action('woocommerce_email_order_details'), WP_Hook->do_action, WP_Hook->apply_filters, WC_Emails->order_details, wc_get_template, include('/plugins/woocommerce/templates/emails/email-order-details.php'), do_action('woocommerce_email_before_order_table'), WP_Hook->do_action, WP_Hook->apply_filters, Wf_Woocommerce_Packing_List_Pay_Later_Payment->email_instructions, WC_Abstract_Legacy_Order->__get, wc_doing_it_wrong. This message was added in version 3.0.