Time Machine says it need 21 TB space when I only have a 500 GB drive in the computer.

Hi,  I have a MacBook and was trying to run a Time Machine backup when I got an error saying: "The backup is too large for the backup disk.  The backup requires 21.09 TB but only 369.26 GB are available."
I have a 500 GB drive in the MacBook and it only has about 150 GB taken up.  I also have a 500 GB drive for the Time Machine and it is not even half way full.  Any ideas as to how I can make it work?
I'm running Mac OS X 10.6.7 and I have the lat 2009 white MacBook.  Wasn't having any issues with the Time Machine until just now.
Thanks.

It seems you're not alone with this problem.  This is the suggested fix, but I've never tried it myself:
http://reviews.cnet.com/8301-13727_7-10330105-263.html
Good luck
Bob

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