Appointments Not Showing in Easy Appointments >> Appointments

Console has the ff errors
Uncaught TypeError: _.findWhere(…) is undefined

Uncaught TypeError: _.findWhere(...) is undefined
    Underscore 2
    render wp-content/plugins/easy-appointments/js/settings.prod.js?ver=3.4.12:695
    showRows /wp-content/plugins/easy-appointments/js/settings.prod.js?ver=3.4.12:345
    forEach Underscore
    H/</i.prototype[e]</< Backbone
    showRows /wp-content/plugins/easy-appointments/js/settings.prod.js?ver=3.4.12:334
    Backbone 6
    jQuery 4

The page I need help with: [log in to see the link]