Plugin not working

Hi,
I have installed the plugin to run on the page https://bhawanipurdesignacademy.org. It should appear at the bottom under where it says ‘Academic Calendar’. It is not showing up.

Also, the Calendar has the following message:
“While trying to retrieve events, Google returned an error:
Error calling GET https://www.googleapis.com/calendar/v3/calendars/https%3A%2F%2Fcalendar.google.com%2Fcalendar%2Fical%2Finfo%2540bhawanipurdesignacademy.org%2Fpublic%2Fbasic.ics/events?singleEvents=true&maxResults=2500&timeMin=2017-01-28T00%3A00%3A00%2B00%3A00&timeMax=2019-02-26T23%3A59%3A59%2B00%3A00&key=AIzaSyCcS9OnUcuAxWdBAMMxEtvnT_MQu-dxeqY: (404) Not Found”.
I have recreated the API and yet the problem persists.
Please help.
Thanks
Samit