A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_REFERER

Filename: common/header_v.php

Line Number: 30

Backtrace:

File: /var/www/html/application/views/common/header_v.php
Line: 30
Function: _error_handler

File: /var/www/html/application/controllers/Art_detail.php
Line: 24
Function: view

File: /var/www/html/index.php
Line: 315
Function: require_once