Second error looks like it has something to do with a filename. I've had issues with "foreign characters" in Modul8 before. When dealing with computers, it's always a good idea to only use a-z,0-9,.-_ (no spaces) for filenames to be sure they will work in all programs on all platforms.
YES the problem is with the files name (some contain French accented characters).
There is no problem with Modul8 Media Set (as developers are speaking French they beware of that I think!), but it bugs in Media Set Load.
It's why I was wondering what modification in the code we'll have to do to make this module compatible with accented characters.
(I have already 100 medias ordered in my Media Set: hard work to reimport renamed files and reorder them all)