A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_REFERER

Filename: controllers/LanguageSwitcher.php

Line Number: 13

Backtrace:

File: C:\Webspace\phuglong.com\httpdocs\application\controllers\LanguageSwitcher.php
Line: 13
Function: _error_handler

File: C:\Webspace\phuglong.com\httpdocs\index.php
Line: 315
Function: require_once