Without specific instructions on how to recreate (where to look in, and what to do with the demos), it would be rather difficult to be sureץ
However I'ved had a look at the model and see an obvious problem with uploading, which looks as follows:
Modeled this way, upload will fail, due to browser security limitations.
Instead, you should pass the File structure directly to the Service, as in the following:
See http://www.tersus.com/#Id=761 for additional details.
For best results, use the Firefox browser..