# Glycans addition to a protein receptor

**URL:** <https://gromacs.bioexcel.eu/t/glycans-addition-to-a-protein-receptor/2602>\
**Category:** User discussions\
**Created:** [July 28, 2021, 12:34pm UTC](https://gromacs.bioexcel.eu/t/glycans-addition-to-a-protein-receptor/2602 "2021-07-28T12:34:31Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sdiaf](https://avatars.discourse-cdn.com/v4/letter/s/958977/32.png) [@sdiaf](https://gromacs.bioexcel.eu/u/sdiaf)\
**Post date:** [July 28, 2021, 12:34pm UTC](https://gromacs.bioexcel.eu/t/glycans-addition-to-a-protein-receptor/2602/1 "2021-07-28T12:34:31Z")

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GROMACS version: 2018  
GROMACS modification: Yes/No  
Here post your question  
I am using doglycans software and utilizing GROMACS to add N-linked and O-linked glycans to my protein receptor, but I get a “KeyError:8603” after the execution of the command. would you please help me how to resolve the error.