# Invalid input values

**URL:** <https://gromacs.bioexcel.eu/t/invalid-input-values/7881>\
**Category:** User discussions\
**Tags:** mdp-parameters\
**Created:** [December 18, 2023, 6:28pm UTC](https://gromacs.bioexcel.eu/t/invalid-input-values/7881 "2023-12-18T18:28:09Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Roger](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/roger/32/1992_2.png) [@Roger](https://gromacs.bioexcel.eu/u/Roger)\
**Post date:** [December 18, 2023, 6:28pm UTC](https://gromacs.bioexcel.eu/t/invalid-input-values/7881/1 "2023-12-18T18:28:09Z")

</div>

GROMACS version: 2023.3  
GROMACS modification: Yes  
Here post your question Command lines :  
gmx grompp -f EminVac1.mdp -ignh -c 2L86\_in\_Box.gro -p 2L86.top -o 2L86\_EminVac1.tpr -maxwarn 1 gmx mdrun -v -deffnm 2L86\_EminVac1  
I get this message:  
Error in user input:  
Invalid input values  
In option s  
Required option was not provided, and the default file ‘topol’ does not  
exist or is not accessible.  
The following extensions were tried to complete the file name: .tpr  
How can I solve this issue?  
Thanks