[eluser]CroNiX[/eluser]
extensions to CI Core classes go in ... /application/core. You also shouldn't be loading MY_Model directly, which I assume you are or you wouldn't have gotten that error message. It will get loaded automatically whenever one of your models extends MY_Model.
/application/core/MY_Model.php
Code:
class MY_Model extends CI_Model {
}
/application/models/some_model.php
Code:
class Some_model extends MY_Model {
}
Code:
$this->load->model('some_model');
Never:
Code:
$this->load->model('MY_Model');