# Cut-off scheme option not recognized

**URL:** <https://gromacs.bioexcel.eu/t/cut-off-scheme-option-not-recognized/1377>\
**Category:** User discussions\
**Created:** [January 4, 2021, 1:59am UTC](https://gromacs.bioexcel.eu/t/cut-off-scheme-option-not-recognized/1377 "2021-01-04T01:59:17Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![HUANG](https://avatars.discourse-cdn.com/v4/letter/h/8797f3/32.png) [@HUANG](https://gromacs.bioexcel.eu/u/HUANG)\
**Post date:** [January 4, 2021, 1:59am UTC](https://gromacs.bioexcel.eu/t/cut-off-scheme-option-not-recognized/1377/1 "2021-01-04T01:59:17Z")

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GROMACS version: 4.6.5  
GROMACS modification: No

I got the following error message while running parallelized simulations with OpenMP:

_OpenMP threads have been requested with cut-off scheme Group, but these are only supported with cut-off scheme Verlet_

I set the cut-off scheme to Verlet by adding the line “cutoff-scheme = Verlet” to my mdp files, as suggested in the gmx-users mailing list ([https://mailman-1.sys.kth.se/pipermail/gromacs.org\_gmx-users/2014-March/088079.html](https://mailman-1.sys.kth.se/pipermail/gromacs.org_gmx-users/2014-March/088079.html)).

However, with this modification to my mdp files, I am still getting the same error message as above.

The Gromacs I used is installed via Anaconda.

Thank you for your help in advance!

Kind regards,

Gangtong

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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:** [January 5, 2021, 3:50pm UTC](https://gromacs.bioexcel.eu/t/cut-off-scheme-option-not-recognized/1377/2 "2021-01-05T15:50:58Z")

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> [@HUANG](#):
>
> However, with this modification to my mdp files, I am still getting the same error message as above.

You need to regenerate the `.tpr` file with this updated `.mdp` file.

> [@HUANG](#):
>
> GROMACS version: 4.6.5

**Please** use a supported version of GROMACS. Support for the 4.6 series ended years ago.

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<div class="post-metadata">

**Author:** ![HUANG](https://avatars.discourse-cdn.com/v4/letter/h/8797f3/32.png) [@HUANG](https://gromacs.bioexcel.eu/u/HUANG)\
**Post date:** [January 6, 2021, 1:07am UTC](https://gromacs.bioexcel.eu/t/cut-off-scheme-option-not-recognized/1377/3 "2021-01-06T01:07:46Z")

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Hi Dr. Lemkul, thank you for your suggestion!  
I now opted for Gromacs 2018.3 and solved the problem by setting “coulombtype=Cut-off”, “vdwtype=Cut-off”, “cutoff-scheme=Verlet” in all the mdp files.