# Error in user input: Invalid command-line options Unknown command-line option -plumed

**URL:** <https://gromacs.bioexcel.eu/t/error-in-user-input-invalid-command-line-options-unknown-command-line-option-plumed/7313>\
**Category:** User discussions\
**Created:** [October 2, 2023, 12:40pm UTC](https://gromacs.bioexcel.eu/t/error-in-user-input-invalid-command-line-options-unknown-command-line-option-plumed/7313 "2023-10-02T12:40:41Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![sal13s](https://avatars.discourse-cdn.com/v4/letter/s/eb9ed0/32.png) [@sal13s](https://gromacs.bioexcel.eu/u/sal13s)\
**Post date:** [October 2, 2023, 12:40pm UTC](https://gromacs.bioexcel.eu/t/error-in-user-input-invalid-command-line-options-unknown-command-line-option-plumed/7313/1 "2023-10-02T12:40:41Z")

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GROMACS version: 2023.2  
GROMACS modification: No

I am trying to patch gromacs with plumed (latest version). I already patched gromacs with plumed, and everything seems to be okay, however, when I try to run the following command " gmx mdrun -s topol.tpr -nsteps 5000000 -plumed plumed.dat" I get the error in the title, which is, that the flag, -plumed, is unkown. Anyone had this error before and knows what may be casuing the problem or how to resolve it?

kind regards!

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**Author:** ![hess](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/hess/32/416_2.png) [@hess](https://gromacs.bioexcel.eu/u/hess)\
**Post date:** [October 3, 2023, 4:37pm UTC](https://gromacs.bioexcel.eu/t/error-in-user-input-invalid-command-line-options-unknown-command-line-option-plumed/7313/2 "2023-10-03T16:37:05Z")

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This is a question for PLUMED, not GROMACS.

But likely you called a binary that is not patched with PLUMED.