Magento admin stopped working

Hello, Until yesterday it was working fine. Now, when I try to viste http://XXXXXXXXXXXXXX.compute-1.amazonaws.com/magento/index.php/admin I get the follwing:

Site error: the file /opt/bitnami/apps/magento/htdocs/app/code/local/Aggrosoft/Shirtnetwork/Model/Sales/Order.php requires the ionCube PHP Loader ioncube_loader_lin_5.3.so to be installed by the website operator. If you are the website operator please use the ionCube Loader Wizard to assist with installation.

What is wrong?

Thanks!