u can edit the testscript, should be no problem.
How u edit ur script? Wich editor u used?
Do the folders, u are mounting in, already exists on ur internal drive? Music and Pictures should be there, but "VIDEO" folder, not shure if it already exists on ur device. maybe this is the problem. Before starting the script, be shure u write ur folders right and be shure ur folders are already created on ur internal drive.

greets nuts