Re: Multiplicity of Parameters for dihedral bond exceeded

From: Ajasja Ljubetič (
Date: Wed Nov 25 2009 - 03:42:35 CST


I have search the mailing list for related problems, but none of the threads
seem to offer a conclusive solution.

NAMD exits with the following message:

FATAL ERROR: Multiplicity of Paramters for diehedral bond C NH1 CT1 C of 1

This is probably related to the topology file for the MTSL spin label
(residue CMTS in the psf file), but for the life of me, I cannot figure out,
where the dihedral is duplicated.

> The psf file was generated with CHARMM and written using "write psf card
xplor" at BOMLEV -1.

What would be the best way to find the duplicated dihedral angle? Could I
perhaps just make NAMD ignore the multiplicity (like CHARMM obviously does)?


PS: should I be concerned about the following NAMD warnings?

Warning: Ignored 5860 bonds with zero force constants.

> Warning: Will get H-H distance in rigid H2O from H-O-H angle.


I have attached the following files:
(My e-mail message has not shown up in the mailing list, perhaps because of
an attachment, that is why the following files have been uploaded to

ekvinatoksin.log -- the log file form NAMD

> ekvinatoksin.start.1ns.conf -- the NAMD configuration file

> par_all27_prot_lipid_pf.inp -- CHARMM27 parameter file

> top_all27_prot_lipid_pf.inp -- CHARMM27 topology file

> top_cmtssl2_c22_pf.inp -- topology file of the spin label

> write_namd_psf.inp -- Charmm inputfile used to generate the PSF

> write_namd_psf.inp -- Charmm output file of the PSF generation

> weqii-i18c.namd.psf -- the resulting problematic PSF file


Thank you for your help & best regards,

> Ajasja Ljubetic

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