[gmx-users] Fatal error: Unknown bond_atomtype cn9 in Charmm27

Mijiddorj Batsaikhan b.mijiddorj at gmail.com
Mon Jan 16 05:04:44 CET 2017

Dear gmx users,

I am using gromacs-v5.1 with charmm27 force field that extended by
swissparams D amino acids.

I got a following error.

Fatal error:
Unknown bond_atomtype cn9
I searched some solutions, but there is no clear solution.
I also checked in atomtype.atp, etc., I could not find cn9, There are all

How can I fix this error? please advice me for modification of FF.

Best regards,


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