Problems building a MAF (tweecer)

I'm having a problem building a new MAF from my datalog.

When using EA, I open the datalog and can perform playbacks, etc.
When I goto the "MAF" tab, and click on the "Calculate" button a pop-up window appears complaining about a row containing a blank or Null value. I have removed the row only to have EA complain about another row...and this goes on and on.

http://i598.photobucket.com/albums/tt67/DonMaximo/Tweecer/problem-1.jpg

I'm also including a pic of my defined Payload.
http://i598.photobucket.com/albums/tt67/DonMaximo/Tweecer/payload-prob1.jpg

Any help would greatly appreciated.
 
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