# ERROR 1 Unknown bond\_atomtype

**URL:** https://gromacs.bioexcel.eu/t/error-1-unknown-bond-atomtype/9941
**Category:** User discussions
**Created:** [August 21, 2024, 5:54am UTC](https://gromacs.bioexcel.eu/t/error-1-unknown-bond-atomtype/9941 "2024-08-21T05:54:08Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Yaninay](https://avatars.discourse-cdn.com/v4/letter/y/9fc348/32.png) [@Yaninay](https://gromacs.bioexcel.eu/u/Yaninay)
#### Post date: [August 21, 2024, 5:54am UTC](https://gromacs.bioexcel.eu/t/error-1-unknown-bond-atomtype/9941/1 "2024-08-21T05:54:08Z")

</div>

GROMACS version:  
GROMACS modification: Yes/No  
ERROR 1 [file unk.prm, line 4]: Unknown bond\_atomtype CG2DC1