Issue with Appointments +

FIRST: Sorry for posting this wrong, but the site will not report that I just installed Appointments+

In Appointsments + when I select the Create an Appointment Page and select something in the field and click the Save settings button I get this Message:

Warning: Missing argument 2 for Appointments::save_post() in /usr/home/wsd96189/public_html/wp-content/plugins/appointments/appointments.php on line 685

What is wrong!