A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_ACCEPT_LANGUAGE

Filename: controllers/Usuarios.php

Line Number: 18

Backtrace:

File: /home/cmya/valuame.com.mx/application/controllers/Usuarios.php
Line: 18
Function: _error_handler

File: /home/cmya/valuame.com.mx/index.php
Line: 315
Function: require_once