Appointments having some sort of conflict with my profiles

I'm using a plugin called UltimateMember for user profile creation and I was also trying to use the appointments plugin...however I can't seem to book times. If I turn on debugging, I get the following notice, not sure if it is related:

Notice: Undefined index: page_id in /var/www/wp-content/plugins/appointments/includes/widgets.php on line 212

I'm getting no javascript errors in my console.

To test, try browsing the experts and then attempt to make an appointment. I'm granting support access, thanks