# Setting up Environment (forcefield error)

**URL:** <https://gromacs.bioexcel.eu/t/setting-up-environment-forcefield-error/11665>\
**Category:** User discussions\
**Created:** [March 2, 2025, 5:52pm UTC](https://gromacs.bioexcel.eu/t/setting-up-environment-forcefield-error/11665 "2025-03-02T17:52:16Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![3015119](https://avatars.discourse-cdn.com/v4/letter/3/e19b73/32.png) [@3015119](https://gromacs.bioexcel.eu/u/3015119)\
**Post date:** [March 2, 2025, 5:52pm UTC](https://gromacs.bioexcel.eu/t/setting-up-environment-forcefield-error/11665/1 "2025-03-02T17:52:16Z")

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GROMACS version:  
GROMACS modification: Yes/No  
Here post your question

I am having trouble with the following line of code:  
(gmx grompp -f ions.mdp -c solv.gro -p topol.top -o ions.tpr)  
The errors regarding this have to do with the forcefield parameters in the topol.top file and trouble accessing or locating the em.mdp and ions.mdp files. I got these em.mdp and ions.mdp files from the gromcas websites from the protein-ligand tutorial.