An uncaught Exception was encountered

Type: Error

Message: Class "CI_Controller" not found

Filename: /home/rioglass/public_html/ppa/system/core/CodeIgniter.php

Line Number: 370

Backtrace:

File: /home/rioglass/public_html/ppa/application/core/MY_Config.php
Line: 18
Function: get_instance

File: /home/rioglass/public_html/ppa/application/core/MY_Lang.php
Line: 57
Function: site_url

File: /home/rioglass/public_html/ppa/index.php
Line: 315
Function: require_once