error/moodle/activity task coursemodule not found
From MoodleDocs
I tried to backup a course in Moodle 2.0 and encountered this message. Does anyone meet this before? Yes! I've just installed M2.0. RC1 & RC2 both preformed the backup successfully but not so with R-M2.0
Maybe you have this error: http://tracker.moodle.org/browse/MDL-25432
