# Getting error while generating processed.gro

**URL:** <https://gromacs.bioexcel.eu/t/getting-error-while-generating-processed-gro/3326>\
**Category:** User discussions\
**Created:** [December 18, 2021, 8:15am UTC](https://gromacs.bioexcel.eu/t/getting-error-while-generating-processed-gro/3326 "2021-12-18T08:15:55Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![shravan](https://avatars.discourse-cdn.com/v4/letter/s/ea666f/32.png) [@shravan](https://gromacs.bioexcel.eu/u/shravan)\
**Post date:** [December 18, 2021, 8:15am UTC](https://gromacs.bioexcel.eu/t/getting-error-while-generating-processed-gro/3326/1 "2021-12-18T08:15:55Z")

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GROMACS version: 2021.3  
GROMACS modification: Yes/No  
Here post your question : while generating processed.gro it is showing error like Residue 27 named ASP of a molecule in the input file was mapped to an entry in the topology database, bu the atom CG used in that entry is not found in the input. perhaps your atom and/or residue naming needs to be fixed. how to rectify it.

Thanking you,  
Shravan

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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:** [December 18, 2021, 12:32pm UTC](https://gromacs.bioexcel.eu/t/getting-error-while-generating-processed-gro/3326/2 "2021-12-18T12:32:37Z")

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You have to model in any missing atoms before running `pdb2gmx`.

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**Author:** ![shravan](https://avatars.discourse-cdn.com/v4/letter/s/ea666f/32.png) [@shravan](https://gromacs.bioexcel.eu/u/shravan)\
**Post date:** [December 20, 2021, 5:30am UTC](https://gromacs.bioexcel.eu/t/getting-error-while-generating-processed-gro/3326/3 "2021-12-20T05:30:33Z")

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Thank you sir