A PHP Error was encountered

Severity: Notice

Message: Trying to get property of non-object

Filename: controllers/Download.php

Line Number: 87

Backtrace:

File: C:\xampp\htdocs\fkkeperawatan\application\controllers\Download.php
Line: 87
Function: _error_handler

File: C:\xampp\htdocs\fkkeperawatan\index.php
Line: 315
Function: require_once