@RonR i dont know that module. we provide support for google calendars as part of the base
package. get the ical format url, public or private
and put that in the url: property
see the startup config.js which uses a calendarlabs url
to get the url
open your calendar in a web browser, select the specific source in the left nav, click the 3 dot menu to the right, settings
scroll down to sharing, select the ical format url (not embed)
or secret url