public function error_order( $order ) {

		$order = is_a( $order, 'LLMS_Order' ) ? $order : llms_get_post( $order );
		if ( ! ( $order && is_a( $order, 'LLMS_Order' ) ) ) {
			return;
		}

		$order->unschedule_recurring_payment();

		/**
		 * Determine if student should be unenrolled on order error.
		 *
		 * @since 4.2.0
		 *
		 * @param bool       $unenroll_on_error_order True if the student should be unenrolled, false otherwise. Default true.
		 * @param LLMS_Order $order                   Order object.
		 */
		if ( ! apply_filters( 'llms_unenroll_on_error_order', true, $order ) ) {
			return;
		}

		switch ( current_filter() ) {

			case 'lifterlms_order_status_trash':
			case 'lifterlms_order_status_cancelled':
			case 'lifterlms_order_status_on-hold':
			case 'lifterlms_order_status_refunded':
			case 'llms_order_recurring_charge_aborted_product_deleted':
				$status = 'cancelled';
				break;

			case 'lifterlms_order_status_expired':
			case 'lifterlms_order_status_failed':
			default:
				$status = 'expired';
				break;

		}

		llms_unenroll_student( $order->get( 'user_id' ), $order->get( 'product_id' ), $status, 'order_' . $order->get( 'id' ) );

	}