GROMACS version:2024.2.
GROMACS modification: Yes/No
Here post your question I already install python but i recive this error in terminal
This is not really a GROMACS related question, as the error you are getting is due to python and the cgenff script. Have you tried to use python3 as the error comment suggests? I don’t know for which python version the script was written, but most likely is python3.