WP Smart Sort produces 'Nothing Found' page

Hello all,

I’ve installed WP Smart Sort plugin and I was able to get some custom fields to appear on the placesort drop down choice. However, as I select a field to sort, I am directed to a ‘Nothing Found for (category)’ page.

I’ve been trying to fix but have not been successful at it.

Thanks in advance.

https://www.ads-software.com/extend/plugins/wp-smart-sort/