Assuming you have a folder in your home directory called Unpack, take a look at the screenshot below..
Make sure it looks like this before adding the new .torrent file you wish to add..
Eg.
http://image.torrent-invites.com/images/176Unpack.png
One thing don't forget to delete the first one you created in the client, immediately after uploading it to the tracker..
Also make sure the first one you create appears in the Error Tab, if it doesn't appear there then I don't think the second will even work...