Events+ not importing Google Calendar

I can't seem to import Google Calendar into the event calendar. I've tested the codes and followed all of the steps. I checked my error logs and get the following error:

27-Apr-2013 14:13:53] PHP Warning: Missing argument 1 for Eab_Gcal_Importer_GoogleImporter::is_recurring(), called in /home3/bouldfa0/public_html/wp-content/plugins/events-and-bookings/lib/class_eab_importer.php on line 53 and defined in /home3/bouldfa0/public_html/wp-content/plugins/events-and-bookings/lib/plugins/eab-import-google_calendar.php on line 84