Menu doesn't show after migration from mqtranslate

Hello,

i switched from Mqtranslate to qtranslate-X, first i had problem with blank page then i checked error.log saying:

PHP Fatal error: Call to undefined function qtrans_convertURL() in /home/digitalk/public_html/wp-content/themes/compositio/functions.php on line 22

I then removed from functions.php this part of the theme i currently use:

add_filter('wp_nav_menu_items','qtrans_in_nav_function');

function qtrans_in_nav_function ($nav){

   $url = get_bloginfo('url');
   $url_preg = preg_replace('/\//', '\/', $url);

   $qtrans_url = qtrans_convertURL($url);

   $nav = preg_replace('/('.$url_preg.')(\/id)/', $url, $nav);
   $nav = preg_replace('/('.$url_preg.')/', $qtrans_url, $nav);

   return $nav;
}

Now all seems works well but the menu won’t show https://www.digitalking.it
I tried to delete and create new but no success.

The theme in the header.php file is rendered with:

<?php wp_nav_menu( array( 'sort_column' => 'menu_order', 'container_class' => 'menu' ) ); ?>

Any help or suggestion?

Thanks

https://www.ads-software.com/plugins/qtranslate-x/