# Help regarding energy minimisation **URL:** \ **Category:** User discussions\ **Created:** [March 17, 2023, 6:42am UTC](https://gromacs.bioexcel.eu/t/help-regarding-energy-minimisation/5990 "2023-03-17T06:42:21Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Sayan](https://avatars.discourse-cdn.com/v4/letter/s/8dc957/32.png) [@Sayan](https://gromacs.bioexcel.eu/u/Sayan)\ **Post date:** [March 17, 2023, 6:42am UTC](https://gromacs.bioexcel.eu/t/help-regarding-energy-minimisation/5990/1 "2023-03-17T06:42:22Z")
GROMACS version: GROMACS modification: Yes/No Here post your question I am getting error in running the minim file ![IMG20230317001059](https://europe1.discourse-cdn.com/flex017/uploads/bioexcel1/original/2X/8/8b956b17844bb9297001f66d85624fb5a5197759.jpeg) ---
**Author:** ![Karis](https://avatars.discourse-cdn.com/v4/letter/k/ed8c4c/32.png) [@Karis](https://gromacs.bioexcel.eu/u/Karis)\ **Post date:** [March 29, 2023, 2:44pm UTC](https://gromacs.bioexcel.eu/t/help-regarding-energy-minimisation/5990/2 "2023-03-29T14:44:26Z")
Hi, this thread might be what you’re looking for, hope this helps! > [@ERROR No such moleculetype NA](https://gromacs.bioexcel.eu/t/error-no-such-moleculetype-na/4318): > > GROMACS version: GROMACS modification: Yes/No I got this error when I run the line: gmx grompp -f em.mdp -c solv\_ions.gro -p topol.top -o em.tpr -maxwarn 10 in the topol.top there is 3 NA atoms :-) GROMACS - gmx grompp, 2020.1-Ubuntu-2020.1-1 (-: GROMACS is written by: Emile Apol Rossen Apostolov Paul Bauer Herman J.C. Berendsen Par Bjelkmar Christian Blau Viacheslav Bolnykh Kevin Boyd Aldert van Buuren Rudi van Drunen Ant… ---
**Author:** ![Sayan](https://avatars.discourse-cdn.com/v4/letter/s/8dc957/32.png) [@Sayan](https://gromacs.bioexcel.eu/u/Sayan)\ **Post date:** [March 30, 2023, 6:45am UTC](https://gromacs.bioexcel.eu/t/help-regarding-energy-minimisation/5990/3 "2023-03-30T06:45:47Z")
Thank you Sayan Manna