Cancel button in app_my_appointments shortcode broken.

The cancel checkbox doesn't work in the [app_my_appointments] shortcode.

[app_my_appointments gcal="0" allow_cancel="1" strict="1"]

Using Avada & Divi3 themes.

JS error in console:

Uncaught ReferenceError: swal is not defined
    at c.<anonymous> (http://new.newstressclinic.com/wp-content/plugins/appointments/includes/shortcodes/js/my-appointments.js?ver=4.8:1:704)
    at HTMLInputElement.dispatch (http://new.newstressclinic.com/wp-includes/js/jquery/jquery.js?ver=1.12.4:3:12444)
    at HTMLInputElement.r.handle (http://new.newstressclinic.com/wp-includes/js/jquery/jquery.js?ver=1.12.4:3:9173)
my-appointments.dev.js:18

 Uncaught ReferenceError: swal is not defined
    at c.<anonymous> (http://new.newstressclinic.com/wp-content/plugins/appointments/includes/shortcodes/js/my-appointments.js?ver=4.8:1:704)
    at HTMLInputElement.dispatch (http://new.newstressclinic.com/wp-includes/js/jquery/jquery.js?ver=1.12.4:3:12444)
    at HTMLInputElement.r.handle (http://new.newstressclinic.com/wp-includes/js/jquery/jquery.js?ver=1.12.4:3:9173)(anonymous function) @ my-appointments.dev.js:18dispatch @ jquery.js?ver=1.12.4:3r.handle @ jquery.js?ver=1.12.4:3