A PHP Error was encountered

Severity: Notice

Message: Trying to get property of non-object

Filename: controllers/Categories.php

Line Number: 54

Backtrace:

File: /var/www/html/researchreport/application/controllers/Categories.php
Line: 54
Function: _error_handler

File: /var/www/html/researchreport/index.php
Line: 315
Function: require_once

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