No HTML id class pf the post container specified error

I am trying out the plugin on my staging website to test it, I have it applied to the main shop page. whenever I hit any filter, I get this message:

“It appears that this page does not contain a container with the specified ?HTML id or class of the Posts Container?. Try to specify the correct one in the Filter Set settings or the common plugin Settings.”

This is the free version so I can’t specify any ID or Class.

Here is a link to my staging website: https://stage.woodnfun.com/shop/

This plugin seems like exactly what I need but I can’t seem to get it to function correctly.

Would appreciate support in fixing this.