WP Fastest Cache not preloading

Hi,
I am using WP Fastest Cache. When I type in the URL https://codenest.in/?action=wpfastestcache&type=preload, there is nothing shown on the page. It is totally blank.

Also, my “all” cache timeout is set at “every hour”. What command should I add to the cron job to preload after my cache is cleared, i.e. every hour?

Thanks!