using flash media server with moodle whiteboard

I am trying to use flash media server with moodle [Course Management System] to use it the steps tells me to add this line of code : $CFG->fms = 'YourFmsLink'; as following this link : [http://moodlemodules.netcourse.org/2007/11/17/whiteboard/][1] [1]: http://moodlemodules.netcourse.org/2007/11/17/whiteboard/ well I installed my whiteboard module and it works but after I draw a shape on whiteboard write on the whitebord my writings will disappear what is the problem ,Thanks in advance