Building PSF for the system prepared by Packmol

From: faride badalkhani (farideh.khamseh_at_gmail.com)
Date: Thu Jun 09 2016 - 09:27:31 CDT

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Dear NAMD users,

I prepared a solvation box including a single dendrimer using Packmol. The
solvent is fluoroalkane. I have PDB, PSF, Topology and Parameter file for
solvent and solute, separately. When I get solvation box (PDB file) using
Packmol I get the following error:

psfgen) unknown residue type HFA
psfgen) unknown residue type HFA
psfgen) unknown residue type HFA
psfgen) unknown residue type HFA
psfgen) unknown residue type HFA
psfgen) unknown residue type HFA
psfgen) unknown residue type HFA
psfgen) unknown residue type HFA
psfgen) unknown residue type HFA
psfgen) unknown residue type HFA
psfgen) unknown residue type HFA
psfgen) extracted 8283 residues from pdb file
psfgen) Info: generating structure...psfgen) unknown residue type HFA
failed!
ERROR: failed on end of segment
MOLECULE DESTROYED BY FATAL ERROR! Use resetpsf to start over.

which HFA is my solvent molecule.
Would you mind telling me how can I create PSF for solvent+solute?

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