we have this installed on the site which is a multisite

Hi, we have this installed on the site which is a multisite network, the plugin works fine but the paging doesn't?

Page is here http://www.europrotour.com/classified/

The paging tries to go to this path type http://www.europrotour.com/classified/page/2/ and gets a 404.

We are using the post name structure in WP 3.8.3