A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_USER_AGENT

Filename: libraries/Mylibrary.php

Line Number: 319

Backtrace:

File: /home/scholaec/dev.arahkita.com/application/libraries/Mylibrary.php
Line: 319
Function: _error_handler

File: /home/scholaec/dev.arahkita.com/index.php
Line: 296
Function: require_once