Ecshop Vietnam Application Error

The application could not run because of the following error:

Type: E_NOTICE [8]

Message: Undefined index: order in /home/fdiet2fa/dietcontrungxanh.com/DocumentRoot/modules/category.php

Line: 292

Stack trace:

#0 /home/fdiet2fa/dietcontrungxanh.com/DocumentRoot/modules/category.php(292): ErrorHandler->handleError(8, 'Undefined index...', '/home/fdiet2fa/...', 292, Array)
#1 /home/fdiet2fa/dietcontrungxanh.com/DocumentRoot/index.php(25): include_once('/home/fdiet2fa/...')
#2 {main}