Laravel 5.4 - Make view login error

I'm trying to do a controller for my site in this way

class MyController extends BaseController {

public function login()
{   
    $this->layout->testata = View::make('OUT');
    $this->layout->content = View::make('auth.login');
}

but Laravel says "Attempt to assign property of non-object". What's the problem?

Basecontroller has only the contructor

class BaseController extends Controller {

    public $layout = 'a.main';
    protected function setupLayout()
    {
        if ( ! is_null($this->layout))
        {
            $this->layout = View::make($this->layout);
        }
    }

}

Where is the problem?

via Santoo