That is because it is looking for
which doesn't exist. I think the desktop shortcut may have been forgotten from a previous version. The PBI itself just says "Tor" and nothing about Vidalia.
Perhaps someone can look into it and:
a) remove the unused Vidalia desktop shortcut
b) add Vidalia to the Tor PBI
You can also use the TorK PBI, I have tested it and it works.
Hope that clears things up.
PC-BSD 9.0-RC2 AMD64
Tor 0.2.2.34 PBI