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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