Scheduler Web Service invalid call

[Hoang Lam]

Hi everyone/ I'm currently using RadScheduler to create my own Scheduler. For better user experience, I used Web service binding, but only the GetAppointments is invalid. I use my own Advance Template with no resource, only passing extra attributes. 
But eveytime when I Update or Insert, a message box appears with the text "Invalid web service call, missing value for parameter 'appointmentData'".