A PHP Error was encountered

Severity: Notice

Message: Trying to get property of non-object

Filename: controllers/Math.php

Line Number: 589

Backtrace:

File: /home/mehdi89/public_html/department/application/controllers/Math.php
Line: 589
Function: _error_handler

File: /home/mehdi89/public_html/department/index.php
Line: 315
Function: require_once

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