Hi,
I've had the same problem:
http://www.shirt-pocket.com/forums/s...ead.php?t=5471
Just go to Finder>Go>Go to Folder>type "/" without the "". Or run the Terminal command given in the above thread.
There you should find a fake "Volume" that has the name of your backup volume. Just delete it, restart, and do the cloning again. Alternatively you may try another cloning app.