Note: Events disappear after they have passed

Warning: simplexml_load_file(http://www.google.com/calendar/feeds/washingtoncity.org_fbaa1tdn38vr58d0tn35afbtdk%40group.calendar.google.com/public/full?singleevents=true&futureevents=true&orderby=starttime&sortorder=a) [function.simplexml-load-file]: failed to open stream: HTTP request failed! HTTP/1.0 403 Forbidden in /Volumes/web/mainwebsite/cottondays/cal_data.php on line 85

Warning: simplexml_load_file() [function.simplexml-load-file]: I/O warning : failed to load external entity "http://www.google.com/calendar/feeds/washingtoncity.org_fbaa1tdn38vr58d0tn35afbtdk%40group.calendar.google.com/public/full?singleevents=true&futureevents=true&orderby=starttime&sortorder=a" in /Volumes/web/mainwebsite/cottondays/cal_data.php on line 85

Fatal error: Call to a member function asXML() on a non-object in /Volumes/web/mainwebsite/cottondays/cal_data.php on line 92