I'm testing out the URL API "EN: Enroll Event command" for Event Center from the Meeting Page for the Event Center (m.php).  I am sending a test registrant for and it is sending back the error "ThisEventIsInProgram".  This is true, it is an event that is part of a program.  But what does this error mean? I can't find any explanation of it in the URL API Refernce Guide or in the forums. 

The full URL response:
 
https://domain.webex.com/mw0307l/mywebex/default.do?siteurl=domain&AT=EN&RS=ThisEventIsInProgram&ST=FAIL

Can anyone explain what the issue is here?

This error message just indicates that the failure is because the event is in a program. The URL API does not support events that are in a program. Unfortunately, the guide doesn't make this clear but removing the event from the program would correct this error.

If you're willing and able to use the XML API instead of URL API, you will be able to enroll attendees in events that are part of a program using CreateMeetingAttendee. CreateMeetingAttendee is intended to invite attendees to a session, but doubles as a registration/enrollment request by setting the joinStatus value to REGISTER or ACCEPT (ACCEPT automatically approves the registration, REGISTER just submits a request for registration). The XML API does require some additional coding compared to URL API, there are some simple code samples available to get you started in the documentation area of this site.

Nathan, thanks for that reply on 8/24 - I didn't see the update until now with Greg's reply. I haven't looked at the XML API yet but I'll give that a shot. Sounds promising for my situation. Thanks for the guidance.