A PHP Error was encountered

Severity: Notice

Message: Undefined offset: 0

Filename: models/Paper.php

Line Number: 267

Backtrace:

File: /home/user/web/oajis/application/models/Paper.php
Line: 267
Function: _error_handler

File: /home/user/web/oajis/application/controllers/File.php
Line: 30
Function: get

File: /home/user/web/oajis/index.php
Line: 315
Function: require_once