ical feed for each user

Hello guys,

I have a calendar feed (using the Drupal Calendar module) on a site and I'd like to add this calendar to Google Calendar. I have this working for a publicly accessible calendar and it works fine.

The problem now is that each user has their own ics file path which mean each of them have their own private calendar with the ics file that can subcribe at google calendar, ical, outlook...etc etc

currently i give an arguments to the ical feed which is " User > User: Uid "

and the path to the ics file " user/%/event-calendar/ical/calendar.ics "

i can download it via browser with no problem but if i subscribe with google calendar & ical, it show " Could not fetch the url. "

any help will be appreciate.