A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_X_REQUESTED_WITH

Filename: controllers/User.php

Line Number: 12

Backtrace:

File: /www/wwwroot/pilot/application/controllers/User.php
Line: 12
Function: _error_handler

File: /www/wwwroot/pilot/index.php
Line: 315
Function: require_once