Inspite of having DPPC in index file,when I run the command ( i.e., grompp -f nvt.mdp -c em.gro -p topol.top -o nvt.tpr ),I am getting the error:<br><br>Group DPPC not found in indexfile.<br>Maybe you have non-default goups in your .mdp file, while not using the '-n' option of grompp.<br>
In that case use the '-n' option.<br><br>Now, what to do? Please guide me.<br>