# File ions.mdp

**URL:** <https://gromacs.bioexcel.eu/t/file-ions-mdp/4238>\
**Category:** User discussions\
**Tags:** forcefield, mdp-parameters, analysis-tools\
**Created:** [May 31, 2022, 1:37pm UTC](https://gromacs.bioexcel.eu/t/file-ions-mdp/4238 "2022-05-31T13:37:36Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![arillita](https://avatars.discourse-cdn.com/v4/letter/a/ecc23a/32.png) [@arillita](https://gromacs.bioexcel.eu/u/arillita)\
**Post date:** [May 31, 2022, 1:37pm UTC](https://gromacs.bioexcel.eu/t/file-ions-mdp/4238/1 "2022-05-31T13:37:36Z")

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GROMACS version: 5.1.4  
Here post your question:

I have a question for this file about ions.mdp, in this problem when I running the program with that code :  
gmx grompp -f ions.mdp -c 1AKI\_solv.gro -p topol.top -o ions.tpr  
the program already error, and showing screen like this

 ![Screenshot from 2022-05-31 20-13-51](https://europe1.discourse-cdn.com/flex017/uploads/bioexcel1/original/2X/6/62e5ed8c7bc5922d5f8d3561784ff7b2dc34fafc.png)  
Is there any people has the solution about my problem? I hope I can found the answer on this forum.

Sincerly,

Arillita

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<div class="post-metadata">

**Author:** ![alevilla](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/alevilla/32/439_2.png) [@alevilla](https://gromacs.bioexcel.eu/u/alevilla)\
**Post date:** [June 3, 2022, 1:36pm UTC](https://gromacs.bioexcel.eu/t/file-ions-mdp/4238/2 "2022-06-03T13:36:47Z")

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Hi,  
Did you try to use 10 in place of 10.0 and so on?  
\Alessandra