A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_ACCEPT_LANGUAGE

Filename: helpers/functions_helper.php

Line Number: 546

Backtrace:

File: /var/www/app/html/application/helpers/functions_helper.php
Line: 546
Function: _error_handler

File: /var/www/app/html/application/views/login.php
Line: 50
Function: el

File: /var/www/app/html/application/controllers/Login.php
Line: 17
Function: view

File: /var/www/app/html/application/core/IO_Controller.php
Line: 239
Function: index

File: /var/www/app/html/index.php
Line: 322
Function: require_once