[Plugin: FT Calendar] WordPress 3.4.1 problem?

I get this error message when trying to switch months on the calendar view with [ftcalendar]

Fatal error: Call to a member function using_permalinks() on a non-object in /home/bfitlife/public_html/njladies.com/wp-content/plugins/ft-calendar/classes/class-shortcodes.php on line 642

http://ww.wp.xz.cn/extend/plugins/ft-calendar/