A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_REFERER

Filename: controllers/langSwitch.php

Line Number: 24

Backtrace:

File: C:\Inetpub\vhosts\muxtech.com.pk\login.muxtech.com.pk\trackApp\controllers\langSwitch.php
Line: 24
Function: _error_handler

File: C:\Inetpub\vhosts\muxtech.com.pk\login.muxtech.com.pk\index.php
Line: 316
Function: require_once