Classifieds Maker: Ads Archive Not Displaying

I am setting up the classifieds plugin and it is mostly working. I am not able to display the ad archive. The shortcode is on the page and page is selected in settings, but the page is blank with an extra margin added to the top when I load it. The console is showing this error:

Uncaught TypeError: $(...).sortable is not a function
at HTMLDocument.<anonymous> (VM960 scripts-form.js:7)
at i (jquery.js?ver=1.12.4:2)
at Object.fireWith [as resolveWith] (jquery.js?ver=1.12.4:2)
at Function.ready (jquery.js?ver=1.12.4:2)
at HTMLDocument.K (jquery.js?ver=1.12.4:2)

Please advise.