If you want to update order status & state programmaticaly, you try this
$order->setStatus(Mage_Sales_Model_Order::STATE_COMPLETE); $order->setState(Mage_Sales_Model_Order::STATE_COMPLETE);
And you get this error :
The Order state 'complete' must not be set manually.
To fix it, use this :
$order->addStatusToHistory(Mage_Sales_Model_Order::STATE_COMPLETE, "Comments");
$order->setData('state', Mage_Sales_Model_Order::STATE_COMPLETE);
If you ever encounter this error “FPDF error: This document (docuement.pdf) probably uses a compression technique which is not supported by the free parser shipped with FPDI.”, this is a version problem, FPDF library supports only PDF version 1.4 and previous.
So, what can you do ? change PDF version with ghostscript.
Download it here http://www.ghostscript.com/download/gsdnld.html
run to change :
./gs-919-linux_x86_64 -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dNOPAUSE -dQUIET -dBATCH -sOutputFile=file.pdf newfile.pdf