change
var mySourceFolder = Folder("/Volumes/User/Desktop/IN");
var myOutFolder = Folder("/Volumes/User/Desktop/OUT");
to
var mySourceFolder = Folder("~/Desktop/IN");
var myOutFolder = Folder("~/Desktop/OUT");
change
var mySourceFolder = Folder("/Volumes/User/Desktop/IN");
var myOutFolder = Folder("/Volumes/User/Desktop/OUT");
to
var mySourceFolder = Folder("~/Desktop/IN");
var myOutFolder = Folder("~/Desktop/OUT");