I have set up a menu item for a calendar export on the main site. I have copied this URL and used it to set up a new calendar on a new site. When adding the URL to the proper field in the calendar set up, I received the following error:

Not a valid VCALENDAR data file: http ucouncil.com index.php?option=com_jevents&view=icals&layout=ical

Can anyone help?