Ionization Issue In Metalloprotein MD Simulation

[alexnas]

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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?