A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_REFERER

Filename: controllers/Langswitch.php

Line Number: 10

Backtrace:

File: D:\home\site\wwwroot\application\modules\langswitch\controllers\Langswitch.php
Line: 10
Function: _error_handler

File: D:\home\site\wwwroot\index.php
Line: 315
Function: require_once