A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_REFERER

Filename: activity/detail.php

Line Number: 3

Backtrace:

File: /home/cp332558/public_html/sichomphu.go.th/application/views/activity/detail.php
Line: 3
Function: _error_handler

File: /home/cp332558/public_html/sichomphu.go.th/application/controllers/Activity.php
Line: 23
Function: view

File: /home/cp332558/public_html/sichomphu.go.th/index.php
Line: 315
Function: require_once