how to set order status as 'complete' in magento

Question

how do i set order status as \'complete\' manually.

I am using the following code, but its giving error saying, The Order State \'complete\' must not be set man

Answer 1

Set order status programmatically:

http://blog.chapagain.com.np/magento-how-to-change-order-status-programmatically/

change order status to 'Completed'

$orderIncrementId = YOUR_ORDER_INCREMENT_ID;
$order = Mage::getModel('sales/order')
                ->loadByIncrementId($orderIncrementId);

 $order->setState(Mage_Sales_Model_Order::STATE_COMPLETE,true)->save();