My application setup with 2 modules admin and default I test the controller which works fine on modules
but the models doesnt work
I created a model applica
Are you using an autoloader?
If you do you should change the class name (or path) to reflect the path (or class name)
Models <> Model
You should have
Admin_Model_User in admin/model/user.php
or
Admin_Models_User in admin/models/user.php.