src/CarteBlanche/Exception/ErrorException.php
public function productionRendering()
    {
        $args   = array('message'=>$this->getAppMessage());
        $ft     = CarteBlanche::getContainer()->get('front_controller');
        return ($ft ? $ft->renderProductionError($args, 500) : parent::__toString());
    }
public function productionRendering()
    {
        $args   = array('message'=>$this->getAppMessage());
        $ft     = CarteBlanche::getContainer()->get('front_controller');
        return ($ft ? $ft->renderProductionError($args, 500) : parent::__toString());
    }
Render of a production error

@return string