[codeigniter] core/model.php undefined property

A PHP Error was encountered
Severity: Notice
Message: Undefined property: works: $db
File name : core/Model.php



To fix the error , add this sentence within the red circle to \application\config\autoload.php :

$autoload['libraries'] = array('database');

And confirm your model is extend from CI_Model

class Mymodel extends CI_Model{}