GROMACS version: 2023.2
GROMACS modification: No
I realized that the AMBER force fields that GROMACS currently has implemented are kind of dated. I downloaded the AMBER14SB force field from User contributions — GROMACS webpage https://www.gromacs.org documentation but when I created my ions.tpr file I got these errors
ERROR 1 [file topol_Protein_chain_A.itp, line 127581]:
No default Per. Imp. Dih. types
ERROR 2 [file topol_Protein_chain_A.itp, line 127871]:
No default Per. Imp. Dih. types
ERROR 3 [file topol_Protein_chain_A.itp, line 128121]:
No default Per. Imp. Dih. types
ERROR 4 [file topol_Protein_chain_A.itp, line 128129]:
No default Per. Imp. Dih. types
ERROR 5 [file topol_Protein_chain_A.itp, line 128183]:
No default Per. Imp. Dih. types
ERROR 6 [file topol_Protein_chain_A.itp, line 128198]:
No default Per. Imp. Dih. types
ERROR 7 [file topol_Protein_chain_A.itp, line 128425]:
No default Per. Imp. Dih. types
ERROR 8 [file topol_Protein_chain_A.itp, line 128650]:
No default Per. Imp. Dih. types
ERROR 9 [file topol_Protein_chain_B.itp, line 27951]:
No default Per. Imp. Dih. types
I don’t know if this a problem with the force field itself or GROMACS. Also can you install Ambertools, find the force field folder and move them over to GROMACS same way you can use the CHARMM36 force field or am I missing a step?