$product = new Varien_Object(); $product->setError('name', 'Product name cannot be empty');
$order = Mage::getModel('sales/order')->load($orderId); $order->setError('status', 'Order cannot be cancelled');This example uses the setError method on an order object loaded using the Mage namespace. The method sets an error message for the "status" attribute, indicating that the order cannot be cancelled. The Varien_Object class is a part of the Magento PHP library, which provides developers with a set of classes and tools for building e-commerce websites using the Magento platform.