iCal format seems to be wrong for Google Calendar

iCal format seems to be wrong for Google Calendar

My iCal feed to google calendar does not work any more.  I have attempted to readd zoho public and private feed and both report "We could not parse the calendar at the URL requested.".  I then used  http://severinghaus.org/projects/icv/ to check your iCal file and it also reported the same problem "Sorry, your calendar could not be parsed."

Any ideas?