# Error creating a protein topology

**URL:** https://gromacs.bioexcel.eu/t/error-creating-a-protein-topology/11388
**Category:** User discussions
**Created:** [January 28, 2025, 6:21am UTC](https://gromacs.bioexcel.eu/t/error-creating-a-protein-topology/11388 "2025-01-28T06:21:41Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![samarth\_kittad](https://avatars.discourse-cdn.com/v4/letter/s/a698b9/32.png) [@samarth\_kittad](https://gromacs.bioexcel.eu/u/samarth_kittad)
#### Post date: [January 28, 2025, 6:21am UTC](https://gromacs.bioexcel.eu/t/error-creating-a-protein-topology/11388/1 "2025-01-28T06:21:41Z")

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GROMACS version:  
GROMACS modification: Yes/No  
Here post your question Fatal error:  
Atom HE2 in residue HIS 15 was not found in rtp entry HSD with 17 atoms  
while sorting atoms. how to solve this error