Custom taxonomy and post type with same slug

I’m using the plugin “types” to register the custom taxonomy and post types,

and got 404 when using the same slug for them to display them hierarchy, like this:

 site.com/tax    //taxonomy archive
 site.com/tax/post-type    //entry

how to make this url structure work ? (notice i’m using a plugin to register tax, types and rewrite)

Thanks