Dear all Gromacs users.

I've simlated the protein-ligand complex system with gromos54a7 force field.I generated topology/parameter file from the cgenff_charmm2gmx_py2.py file and there is no problem until i used "gmx grompp" in add ions step.

Actully when i use the command line below:

gmx grompp -f ions.mdp -c solve.gro -p topol.top -o ions.tpr

fetal error came : " Error 1 file lig.prm , line 4" unknown bond_atomtypy CG 311.

can anyone help to solve this problem?

Thank you.

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