After looking at this a bit more closely for someone else who asked the same question, your clue is here:

dssp cmd='/usr/local/bin/dssp -na dd31ZWbc ddI6at3a > /dev/null 2> /dev/null'

For some reason your do_dssp command is triggering version 1 syntax. A version 2 command should be something like:

dssp cmd='/usr/local/bin/dssp -i ddYB5REk -o ddxi1TAx > /dev/null 2> /dev/null'

Note the difference in -i/-o vs. -na. This is the nature of the problem when dealing with different versions. Somehow there's a disconnect between your DSSP version or the command you're telling us you're issuing.

-Justin

--
==================================================

Justin A. Lemkul, Ph.D.
Ruth L. Kirschstein NRSA Postdoctoral Fellow

Department of Pharmaceutical Sciences
School of Pharmacy
Health Sciences Facility II, Room 629
University of Maryland, Baltimore
20 Penn St.
Baltimore, MD 21201

jalem...@outerbanks.umaryland.edu | (410) 706-7441
http://mackerell.umaryland.edu/~jalemkul

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