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:
'[atoms]'
Invalid order for directive atoms


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

                                          
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