Hi Azamat,
I wasn’t able to fix my problem using this plugin.
In my circumstance I was just trying to make a relationship between a standard WordPress post and a custom post type.
I did some digging around and discovered that the ‘Toolset Types’ plugin has a built-in way of doing this. More information can be found in their documentation… https://wp-types.com/documentation/user-guides/creating-post-type-relationships
I’m having the exact same problem. Seems to be something in the plugin that is not compatible with the latest version of WordPress. So unfortunately the plugin doesn’t work on 4.6.
I’m trying to figure out my own fix, possibly having to use another plugin but it would be great if this was updated!
