Entity class not working on 2 module

To me it looks like your name space is off because your Modules folder is under the app folder.

PHP Code:

namespace Modules\Site\Models;

// should be
namespace app\Modules\Site\Models; 


So all your namespaces and use clauses should start with app\

that namespace work perfect with my acp and other stuff, because i declare my module in my autoload like this:

PHP Code:

$psr4 = [
            'App'         => APPPATH,                // To ensure filters, etc still found,
            APP_NAMESPACE => APPPATH,                // For custom namespace
            'Config'      => APPPATH . 'Config',
            'Modules\Site' => APPPATH . 'Modules/Site',
            'Modules\Acp' => APPPATH . 'Modules/Acp',
            'Modules\Auth' => APPPATH . 'Modules/Auth',
        ];