# Fatal error in gromacs

**URL:** <https://gromacs.bioexcel.eu/t/fatal-error-in-gromacs/5318>\
**Category:** User discussions\
**Created:** [November 25, 2022, 7:17am UTC](https://gromacs.bioexcel.eu/t/fatal-error-in-gromacs/5318 "2022-11-25T07:17:59Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Khadijah5780](https://avatars.discourse-cdn.com/v4/letter/k/ebca7d/32.png) [@Khadijah5780](https://gromacs.bioexcel.eu/u/Khadijah5780)\
**Post date:** [November 25, 2022, 7:17am UTC](https://gromacs.bioexcel.eu/t/fatal-error-in-gromacs/5318/1 "2022-11-25T07:17:59Z")

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GROMACS version:  
GROMACS modification: Yes/No

Hi everyone,

I am beginners in GROMACS and I am trying one tutorial on youtube by [Molecular Dynamics Tutorial | Protein-Ligand Complex: GROMACS - PART 1 - YouTube](https://www.youtube.com/watch?v=PCsg4rBN6wg). However, there were some errors as shown below:

Fatal error:  
atom C1 not found in buiding block 1MET while combining tdb and rtp

May I know how to solve this because in that tutorial, this error was not appear despite I am using the similar protein given. Thank you.

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**Author:** ![jalemkul](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/jalemkul/32/18_2.png) [@jalemkul](https://gromacs.bioexcel.eu/u/jalemkul)\
**Post date:** [November 30, 2022, 2:34pm UTC](https://gromacs.bioexcel.eu/t/fatal-error-in-gromacs/5318/2 "2022-11-30T14:34:06Z")

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Answered here: [Newest CHARMM36 port for GROMACS - #11 by jalemkul](https://gromacs.bioexcel.eu/t/newest-charmm36-port-for-gromacs/868/11)