Unable to recieve email confirmation

Please Help me resolve the issue.
I've installed your Appointment+ plugin.
On booking the appointment client is getting the email, but not the admin or service provider.
Please help.

Also I get a pop window when I book an appointment stating "We are sorry, but this time slot is no longer available. Please refresh the page and try another time slot. Thank you." even though there are no appointments being booked.
Also it shows current dates appointment also as available for past hours.
Thats the link : http://www.jdm.photography/make-an-appointment

Please get back to me with an solution.