Thanks Fahad,
Here is the rest of the error:
“id was called incorrectly. Product properties should not be accessed directly. Backtrace: require(‘wp-blog-header.php’), require_once(‘wp-load.php’), require_once(‘wp-config.php’), require_once(‘wp-settings.php’), do_action(‘wp_loaded’), WP_Hook->do_action, WP_Hook->apply_filters, call_user_func_array, WC_Cart_Session->get_cart_from_session, WC_Cart->calculate_totals, do_action(‘woocommerce_before_calculate_totals’), WP_Hook->do_action, WP_Hook->apply_filters, call_user_func_array, Woo_Discounts_Plus_Plugin->wdp_before_calculate, Woo_Discounts_Plus_Plugin->gather_discount_love, Woo_Discounts_Plus_Plugin->get_actual_id, WC_Abstract_Legacy_Product->__get, wc_doing_it_wrong. This message was added in version 3.0.”