[OS X TeX] broken tex distribution

[Shawn Allgeier]

My TeXshop stopped working.  When I try to compile I receive the  
following message:
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Can't find required tool
(null) does not exist. Perhaps TeXLive was not installed or was  
removed during a system upgrade. If so, go to the TeXShop web site and  
follow the instructions to (re)install TeXLive. Another possibility is  
that a tool path is incorrectly configured in TeXShop preferences.  
This can happen if you are using the fink teTeX distribution.
-----
I tried deleting my old distribution (2007) and upgrading to 2008  
since it was time.  I still receive the same message.  Is something  
configured incorrectly between the front and back ends?

-Shawn