I might be able to figure it out if I had some documentation, but there is none to be found at the moment.
The product would be great, but it does need some documentation, and it would help if failed imports were accompanied by some more complete diagnostic message about the input file.
I'm hoping that there will be some updates to the package. The functionality is very interesting.
Likely the xml file has a wrong encoding. In this case, no item is imported and no error message displays.
In the next release i will add the xml encoding test.