# ERROR 1 \[file topol.top, line 62\]: No such moleculetype CL

**URL:** <https://gromacs.bioexcel.eu/t/error-1-file-topol-top-line-62-no-such-moleculetype-cl/4504>\
**Category:** User discussions\
**Tags:** mdrun\
**Created:** [July 24, 2022, 11:01am UTC](https://gromacs.bioexcel.eu/t/error-1-file-topol-top-line-62-no-such-moleculetype-cl/4504 "2022-07-24T11:01:54Z")\
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**Author:** ![TreeLife](https://avatars.discourse-cdn.com/v4/letter/t/ed655f/32.png) [@TreeLife](https://gromacs.bioexcel.eu/u/TreeLife)\
**Post date:** [July 31, 2022, 7:42am UTC](https://gromacs.bioexcel.eu/t/error-1-file-topol-top-line-62-no-such-moleculetype-cl/4504/4 "2022-07-31T07:42:35Z")

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This seems like a common error.  
I remember seeing it somewhere:

> [@Gmx genion -s proteinions.tpr -o proteinions.gro -p protein.top -pname NA -nname CL -neutral](https://gromacs.bioexcel.eu/t/gmx-genion-s-proteinions-tpr-o-proteinions-gro-p-protein-top-pname-na-nname-cl-neutral/4466/3):
>
> Thanks a lot for the guidance, I added CL to ions.itp file inside charmm and got the results…:)

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