Ionization Issue In Metalloprotein MD Simulation

[naeemhmg]

GROMACS version: 5.0.5
GROMACS modification: Yes/No
I am trying for the ligand-protein docking of metalloprotein (containing zinc) with the ligand. at ionization, step using the following command
gmx grompp -f ions.mdp -c solv.gro -p topol.top -o ions.tpr
I am facing the following issue.

Can you please help me to sort out this issue please? Currently, we are using charmm36 forcefield.

[alexnas]

This thread might be helpful:

Atomtype Cu2+ not found

GROMACS version: 5.2 GROMACS modification: Yes/No Hi, I have a problem; I built a simulation box with a slab of graphene in the middle of the box, filled with water on one side and saline (NaCl) on other side. I have checked the executable files (.gro, .itp, topol , …) several times and they are correct , but I give this error : atomtype Cu2+ not found. Does anyone have any experience to share with me?