A PHP Error was encountered

Severity: Notice

Message: Trying to get property of non-object

Filename: controllers/Doc.php

Line Number: 23

Backtrace:

File: D:\wwwroot1\alipdf.com\app\controllers\Doc.php
Line: 23
Function: _error_handler

File: D:\wwwroot1\alipdf.com\index.php
Line: 316
Function: require_once