It appears that the torrent in question has a space at the end of its announce URL, which is causing it to fail Transmission's URL parser test.
This is an error with the torrent, not Transmission, but it still would probably be best for Transmission to strip leading and trailing whitespace from the announce URLs to handle this more gracefully. This is fixed now in http://trac.transmissionbt.com/changeset/6717
It appears that the torrent in question has a space at the end of its announce URL, which is causing it to fail Transmission's URL parser test.
This is an error with the torrent, not Transmission, but it still would probably be best for Transmission to strip leading and trailing whitespace from the announce URLs to handle this more gracefully. This is fixed now in http:// trac.transmissi onbt.com/ changeset/ 6717