# Gromacs not reading dihedral which is given in respective file

**URL:** <https://gromacs.bioexcel.eu/t/gromacs-not-reading-dihedral-which-is-given-in-respective-file/9305>\
**Category:** User discussions\
**Created:** [June 5, 2024, 6:38am UTC](https://gromacs.bioexcel.eu/t/gromacs-not-reading-dihedral-which-is-given-in-respective-file/9305 "2024-06-05T06:38:51Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Sidharth](https://avatars.discourse-cdn.com/v4/letter/s/ea5d25/32.png) [@Sidharth](https://gromacs.bioexcel.eu/u/Sidharth)\
**Post date:** [June 5, 2024, 6:38am UTC](https://gromacs.bioexcel.eu/t/gromacs-not-reading-dihedral-which-is-given-in-respective-file/9305/1 "2024-06-05T06:38:51Z")

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GROMACS version:2022.6  
GROMACS modification: No  
Hi, I generated a new topology using aAMBERGS forcefield . I’ve been able to build my system successfully, but I got the following error when running grompp prior to energy minimisation:  
ERROR 1 [file topol\_Other\_chain\_B.itp, line 22572]:  
No default Proper Dih. types

ERROR 2 [file topol\_Other\_chain\_B.itp, line 22573]:  
No default Proper Dih. types

ERROR 3 [file topol\_Other\_chain\_B.itp, line 22574]:  
No default Proper Dih. types

ERROR 4 [file topol\_Other\_chain\_B.itp, line 22575]:  
No default Proper Dih. types

ERROR 5 [file topol\_Other\_chain\_B.itp, line 22598]:  
No default Proper Dih. types  
… upto 1608 errors  
the dihedrals are already given in the .rtp file and ffbonded.itp file but it is not detecting and the dihedral func. is given 4 but when it generate topology file it is showing func. 9

Any help would be appreciated!  
Many thanks.