Processing topology
Replacing 2 solute molecules in topology file (cnt.top) by 1 NA and 1 CL ions.
Back Off! I just backed up cnt.top to ./#cnt.top.4#
Using random seed -1410093481.
Program: gmx genion, version 2021.4-Ubuntu-2021.4-2
Source file: src/gromacs/gmxpreprocess/genion.cpp (line 155)
Fatal error:
No more replaceable solvent!