Index: lams_common/src/java/org/lamsfoundation/lams/lesson/service/LessonService.java
===================================================================
diff -u -rfbeb734a6ccb4d08e312fbf1b7fc6eb7bae46535 -rc6bad3471368f1efe540cf05d623c570ef468a0a
--- lams_common/src/java/org/lamsfoundation/lams/lesson/service/LessonService.java	(.../LessonService.java)	(revision fbeb734a6ccb4d08e312fbf1b7fc6eb7bae46535)
+++ lams_common/src/java/org/lamsfoundation/lams/lesson/service/LessonService.java	(.../LessonService.java)	(revision c6bad3471368f1efe540cf05d623c570ef468a0a)
@@ -335,10 +335,13 @@
 		}
 		
 		LessonClass lessonClass = lesson.getLessonClass();
+		
 		if ( lessonClass == null ) {
 			throw new LessonServiceException("Lesson class for "+lessonId+" does not exist. Unable to add staff member to lesson.");
 		}
-
+		
+		lessonDAO.initialize(lessonClass.getStaffGroup());
+		
 		boolean ret = lessonClass.addStaffMember(user);
 		if ( ret ) {
 			lessonClassDAO.updateLessonClass(lessonClass);