A friend of mine is having difficulty with a Tascam DP-O1FX portable studio. When she tries to export the mastered song a message appears saying, "system error 50--please power off. Any ideas of how she should proceed? The unit is only eighteen months old. You may either write to me and I will forward your messages on to her, or you may write to Jo Ann White directly at: rjwhite@xxxxxxxxx Thanks so much, Kimberly