When I run the command (i.e., grompp -f nvt.mdp -c em.gro -p topol.top -n index.ndx -o nvt.tpr)for volume equilibration.
I am getting the error: Fatal error: Group DPPC not found in indexfile. Maybe you have non-default goups in your mdp file, while not using the '-n' option of grompp. In that case use the '-n' option. Please guide me.
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