We'd be glad to help, but not sure why you haven't deleted the receipt that's causing the problem.
The receipt is called ""Install LimeWire.pkg" and is a file in the main library of your hard drive:
Quote:
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* NOTE: You get the "Null error" message in the Apple installer when a OS X thinks a more recent version is installed. Double-click the harddrive icon, open the Library, open the Receipts folder, then find the file: Install LimeWire.pkg, delete it and try again
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Once you delete "Install LimeWire.pkg" you won't get the "null" message.
the above quote is taken from the sticky
http://www.gnutellaforums.com/showth...threadid=36374 and contains more details on the null message, thanks to LOTR