[AMBER] problem in saving prmtop file in ff12SB force field

From: Subrata Paul <paul.subrata34.gmail.com>
Date: Mon, 28 Oct 2013 19:28:09 +0530

Dear Amber user,

I have load a pdb file with ff12sb force filed
then addions to the pdb but
when tried to save the prmtop and inpcrd
it is not saving.
the following command is used

source leaprc.ff12SB
a=loadpdb pro.pdb
addions a Na+ 0
saveamberparm a a.prmtop a.inpcrd

then this error message came

Checking Unit.
Building topology.
Building atom parameters.
For atom: .R<Na+ 16>.A<Na+ 1> Could not find type: Na+
Parameter file was not saved.

why this happening ?

*With Best Regards
PhD Student
Dept of Chemistry.
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Received on Mon Oct 28 2013 - 07:00:03 PDT
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