Every time I reload the page with the megafilter, I get errors: 404 - View not found [name, type, prefix]: featured, html, jamegafilterView
See this url (you need to be logged in): https://bonsai4.farwall.com/index.php/component/jamegafilter#sort=name&sortdir=asc
bonsai
It looks like you've not created any menu item with type of JA Megafilter yet. Could you try to create one?
I tried to log into backend of your site but no luck, kindly share the administrator URL so I can check.