Not really a bug I guess, but when converting my libraries I got plenty of AccessDeniedExeption messages. I guess this is due to my libraries being in the Program Files folder (where B4A sits), which is not writable if you are not an Administrator. You might add a warning here.
It is a mistake to put the additional libs folder in Programfiles as it is a restricted folder.
Put the additional libs into another path. Another Drive, Documentsfolder.