The operation failed because it requires the torrent to have the metadata (.torrent file) and it doesn't have it yet. This happens for magnet links before they have downloaded the metadata, and also torrents added by URL.
the stable integer error value used by libtorrent.
the human-readable description, matching libtorrent's libtorrent_category().message(code). May be empty for reserved/unused slots.
libtorrent_category().message(code)