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Odd Affymetrix Powertools Error For Human Exons St. 1.0 Data

I'm trying to calculate which genes in my microarray samples are expressed above background (produce the dabg.summary.txt file). I've issued the following command in the linux terminal:

apt-probeset-summarize -a dabg -p supportFiles/HuEx-1_0-st-v2.r2.pgf -m  supportFiles/HuEx-1_0-st-v2.r2.dt1.hg18.core.mps -c supportFiles/HuEx-1_0-st-v2.r2.clf -b supportFiles/HuEx-1_0-st-v2.r2.genomic.bgp -o ./OUT_DABG_genomicBg *.CEL

Which gives the following strange error:

Processing Probesets............
FATAL ERROR:No background probes found for GC bin 24 for probe with id: 1025125
Perhaps there is no probe with GC count 24 in bgp-file: supportFiles/HuEx-1_0-st-v2.r2.genomic.bgp

The strange thing is when I use the antigenomic probeset file as background (HuEx-10-st-v2.r2.antigenomic.bgp) I get no error at all, but I need to use genonic (HuEx-10-st-v2.r2.genomic.bgp) to reproduce somebody else's results.

I've no idea what's going on here and found nothing online so any pointers would be a massive help.

Thanks!

affymetrix exon microarray

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