A PHP Error was encountered

Severity: Warning

Message: Attempt to read property "cat_id" on null

Filename: controllers/Courses.php

Line Number: 24

Backtrace:

File: /home3/abdursikder1/vsity.org/application/controllers/Courses.php
Line: 24
Function: _error_handler

File: /home3/abdursikder1/vsity.org/index.php
Line: 315
Function: require_once