use patch/patcher aka embedded patch instead... the videos were made before these existed.
(I think all the demos are now using embedded patches, so you can look for examples there)
as for the example.. the issue you have is probably are having is down to the path of the subpatch... be aware you need to save both the main and subpatch before you compile.
apart from that we would need to see the error, and exactly what you have done.
... anyway as i said, use embedded patches , much better