I have the same thing going on with a site i am working on. I have two different site I help with and they both use this calendar and one works and one doesn’t. The second is just a redesign of a existing site so it is not live yet but would like to get this figured out. Here is the error message i am getting:
Something went wrong while fetching events.
The request status is: 200
The error thrown was: SyntaxError: expected expression, got ‘<‘
The site link is:
http://newtestsite.pcrro.org/calendar/