# Fatal errors : There were 815 errors in input file(s)

**URL:** <https://gromacs.bioexcel.eu/t/fatal-errors-there-were-815-errors-in-input-file-s/7839>\
**Category:** User discussions\
**Created:** [December 11, 2023, 7:36am UTC](https://gromacs.bioexcel.eu/t/fatal-errors-there-were-815-errors-in-input-file-s/7839 "2023-12-11T07:36:17Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![shivangi3800](https://avatars.discourse-cdn.com/v4/letter/s/848f3c/32.png) [@shivangi3800](https://gromacs.bioexcel.eu/u/shivangi3800)\
**Post date:** [December 11, 2023, 7:36am UTC](https://gromacs.bioexcel.eu/t/fatal-errors-there-were-815-errors-in-input-file-s/7839/1 "2023-12-11T07:36:17Z")

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GROMACS version:  
GROMACS modification: Yes/No  
Here post your question  
NOTE 1 [file ions.mdp]:  
With Verlet lists the optimal nstlist is \>= 10, with GPUs \>= 20. Note  
that with the Verlet scheme, nstlist has no effect on the accuracy of  
your simulation.

Setting the LD random seed to -1921589251

ERROR 1 [file unk1.prm, line 1]:  
Incorrect number of atomtypes for dihedral (4 instead of 2 or 4)

ERROR 2 [file unk1.prm, line 3]:  
Incorrect number of atomtypes for dihedral (0 instead of 2 or 4)

ERROR 3 [file unk1.prm, line 4]:  
Incorrect number of atomtypes for dihedral (3 instead of 2 or 4)  
how to solve this issue???