Why can't I add an event to my calendar in Zoho Creator/Deluge?

I am trying to build a script using Deluge in Zoho Creator which will create a calendar event in Zoho Calendar when a new form is submitted or an existing form is updated. I am using the Zoho Calendar connection with the following code:

response = zoho.calendar.createEvent("<calendar-uid>", {"title":"New Event","dateandtime": {"start": "20210307T110000+0530","end": "20210308T120000+0530","timezone": "Asia/Kolkata"}}, "my_calendar_connection");
info response;

The response returns:

{"error":[{"description":"eventdata missing.","message":"LESS_THAN_MIN_OCCURANCE"}]}

I created a custom calendar connection in the Zoho Creator connections page. I see that there was a system provided Calendar connection, but when I clock "Authorize", nothing happens. I created my own to see if it made any difference.

Created connections in the Zoho Creator connections page.

Am I missing any steps here?

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