iCal and Gmail

Since upgrading to the new software for mac, my iCal is giving me the following notification for my gmail calendar (not @gmail, but a gmail server, i.e. @graysonmail.com). I've pasted the error below for any help anyone can offer;

http://www.google.com/calendar/ical/jerry.p@graysonmail.com/public/basic.ics//www.google.com/calendar/ical/jerry.p@graysonmail.com/public/basic.ics is not a location that supports this request.