Override doesn't work

[gonliSs]

Hello,

 

I use the newest presta.

I have such file in override\controllers:

class FrontController extends FrontControllerCore
{
    public function setMedia()
    {
        parent::setMedia();   
        $this->addCSS(_THEME_CSS_DIR_.'custom.css');  
    }
}

(I tried also with <?php and ?> at the beginning and end of this file)

 

And it doesn't work. It does not include the custom.css file to my shop. I was trying delete file: cache/class_index.php but it won't help.

 

I was trying to create new override controller (ProductController) but it also doesn't work. It seems that overrides doesn't work on my shop. Could anyone help me with that?