A PHP Error was encountered

Severity: Notice

Message: Undefined variable: section_name

Filename: models/Articles_model.php

Line Number: 57

Backtrace:

File: /var/www/daag/application/models/Articles_model.php
Line: 57
Function: _error_handler

File: /var/www/daag/application/controllers/Article.php
Line: 61
Function: articleBySection

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