A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_REFERER

Filename: controllers/Swlang.php

Line Number: 13

Backtrace:

File: D:\home\site\wwwroot\application\controllers\Swlang.php
Line: 13
Function: _error_handler

File: D:\home\site\wwwroot\index.php
Line: 296
Function: require_once