Gmx genion -s ions.tpr -o solv_ions.gro -p topol.top -pname NA -nname CL -neutral

GROMACS version: gmx genion, version 2020.1-Ubuntu-2020.1-1
GROMACS modification: Yes/No
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I have problem when I run this command, there is no the serial number of solution 15 , how can I solve this ?

Hi,
gmx genion needs as input an index file with the water molecules. This is missing in your case. You can check if your tpr file contains information on water molecules.
\Alessandra