# Error Coordinat not matching gromacs

**URL:** <https://gromacs.bioexcel.eu/t/error-coordinat-not-matching-gromacs/10231>\
**Category:** User discussions\
**Tags:** energy-minization\
**Created:** [September 25, 2024, 12:30pm UTC](https://gromacs.bioexcel.eu/t/error-coordinat-not-matching-gromacs/10231 "2024-09-25T12:30:46Z")\
**Posts on this page:** 1\
**Showing post:** 18

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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 30, 2024, 8:14am UTC](https://gromacs.bioexcel.eu/t/error-coordinat-not-matching-gromacs/10231/18 "2024-09-30T08:14:15Z")

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Check your input files. As it says: “If there are other molecules such as ligands, they should not have the same chain ID as the adjacent protein chain since it’s a separate molecule.” Modfiy the chain ID if you have to.

Does the force field you are using have parameters for Cu ions?

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