How do I fix this error :"Group referenced in the .mdp file was not found in the index file." ? when running grompp on gromacs?

10 October 2018 0 8K Report

When I run grompp in gromacs to generate tpr file, I get this error :"Group referenced in the .mdp file was not found in the index file.".

These are my .mdp file and my index.ndx file. This is my command:

$gmx grompp -f md2-1.mdp -c nvt.gro -n index.ndx -t nvt.cpt -p topol.top -o md2.tpr -maxwarn 2

Could anyone give me some help? Thank you so much!

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