# Error in making protein topology

**URL:** https://gromacs.bioexcel.eu/t/error-in-making-protein-topology/10219
**Category:** User discussions
**Created:** [September 23, 2024, 5:22pm UTC](https://gromacs.bioexcel.eu/t/error-in-making-protein-topology/10219 "2024-09-23T17:22:46Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![MagnusL](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/magnusl/32/2380_2.png) [@MagnusL](https://gromacs.bioexcel.eu/u/MagnusL)
#### Post date: [September 24, 2024, 8:55am UTC](https://gromacs.bioexcel.eu/t/error-in-making-protein-topology/10219/2 "2024-09-24T08:55:40Z")

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Either there is a missing atom in the PDB file or it is incorrectly named. See [Common errors when using GROMACS - GROMACS 2024.3 documentation](https://manual.gromacs.org/current/user-guide/run-time-errors.html#atom-x-in-residue-yyy-not-found-in-rtp-entry) and [Residue mapped into topology database but atom name not found in file? - #11 by jalemkul](https://gromacs.bioexcel.eu/t/residue-mapped-into-topology-database-but-atom-name-not-found-in-file/3675/11) for more information.

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