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Illegal block size - FFT STOP

Hi all,
 
Is there any way other than trial and error of selecting the correct block size to use in dasylab V9.0.0???
 
I have 4 inputs from a daq board (essentially 4 sine waves from 0-2KHz) When I have only one input it wors a treat and is wonderful but with 4 inputs I cant seem to get teh block size correct and the error is with the FFT moduleand stops there.
 
I have tried using trhe Autoselect on the block size (thinking it would select the a workable size) but it still comes up with the same error?
 
in DAQMX I have a 20KHz sampling rate with a block size of 1024.
 
Dasylab V9.0.0 and DAQMX V8.0
 
any suggestions are appreciated
thanks in advance to you all
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Sorry Everyone I posted this on the wrong Forum... wil now post on correct forum but thanks anayway 🙂
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