I gave the command gmx grompp -f nvt.mdp -c em.gro -r em.gro -p topol.top -n index.ndx -o nvt.tpr while doing the MD run in gromacs but I got the above error .But now I am in dilemma where the mistake is occuring in correcting the file name. I am confused plz help me out.I am attaching the files below.

Thanks

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