A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_ACCEPT_LANGUAGE

Filename: helpers/tool_helper.php

Line Number: 4064

Backtrace:

File: /www/wwwroot/tg_site_merge/application/helpers/tool_helper.php
Line: 4064
Function: _error_handler

File: /www/wwwroot/tg_site_merge/application/core/MY_Controller.php
Line: 250
Function: getPreferredLanguage

File: /www/wwwroot/tg_site_merge/application/controllers/Tggame.php
Line: 11
Function: __construct

File: /www/wwwroot/tg_site_merge/index.php
Line: 334
Function: require_once