I already tried with the requires_once and the included but I still get an error:
The menu page that gives you the error is in views / aplication and you are trying to access two directories above but you only use a directory escape .
With the instruction you are using you would be looking for claseheredada.php
within the folder views and that is not where it seems to be.
Updated example:
require_once '../../modelo/claseheredada.php';