Google Calendar Add Event Service

I am trying to use the google.add_event service. I continue to receive this error:

expected a dictionary for dictionary value @ data[‘in’]

Here is what I believe follows the example, but the call services button is deactivated, so it doesn’t work. I have also tried it as a script, with no luck.

calendar_id: [email protected]
summary: Yard Care
description: Fertlized Lawn
in: "days": 0

I have also tried different variations of that line like:

in: days: 0


in: "days":0

Thanks for any help!