I am not sure, but in your case my guess is that it is due to the missing special character support of QuickTorrentMaker, unless you've uploaded your other torrents from the same Windows user account and with QTM, too.
Actually I think your Windows user name is not "V.n", but that in the place of the dot "." you've got an accent on the letter. This leads to QTM not being able to use the right file path for your account's application data directory.
It might be better you use the web interface to upload torrents.