[gmx-users] Error in generating DPPC using grompp

shobana visolingam nasara_anisho at hotmail.com
Fri Jan 21 11:55:40 CET 2011

dear all, 

i am new to gromacs and i'm trying to run the command grompp -c lipo1grobox.pdb -p topol.top -f em_restraints.mdp -o em_restraints.tpr.

however i got this error

Opening library file /usr/local/gromacs/share/gromacs/top/ff_dum.itp

ERROR 1 [file ffgmxbon_lipid.itp, line 756]:
  Invalid directive DPPC

Program grompp, VERSION 4.0.4
Source code file: topio.c, line: 415

Fatal error:
Syntax error - File ffgmxbon_lipid.itp, line 757
Last line read:
Invalid order for directive atoms

can i know what this error mean and how to overcome it?? thanks.

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