Sort query by custom meta field

Hi guys, i’ve created a new CPT with Types plugin and added a checkbox in custom fields named “wpcf-evidenza”.

Now i need to query my CPT “hotel” and sort the query posts based on the checkbox’s value, (1 checked, 0 otherwise).

hotels with checked checkbox should appear before the others, i’ve followed a lot of discussion about this thing and the most part of users with the same problem have solved with a query very similar to this:

query_posts(array(
'post_type' => 'hotel',
'posts_per_page' => 3,
'paged' =>$paged ,
'meta_key' => 'wpcf-evidenza',
'orderby' => 'meta_value_num' ,
'order' => 'DESC'
));

But seems not working for me, what could be the problem?

Thank You 🙂

https://wordpress.org/plugins/types/