# Cgenff\_charmm2gmx error

**URL:** <https://ask.bioexcel.eu/t/cgenff-charmm2gmx-error/2781>\
**Category:** General Topics in Molecular Dynamics\
**Created:** [January 18, 2021, 9:15pm UTC](https://ask.bioexcel.eu/t/cgenff-charmm2gmx-error/2781 "2021-01-18T21:15:27Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![mohammad](https://avatars.discourse-cdn.com/v4/letter/m/e274bd/32.png) [@mohammad](https://ask.bioexcel.eu/u/mohammad)\
**Post date:** [January 18, 2021, 9:15pm UTC](https://ask.bioexcel.eu/t/cgenff-charmm2gmx-error/2781/1 "2021-01-18T21:15:27Z")

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Hi. I try to convert cgenff server output by cgenff\_charmm2gmx for gromacs but get an error. I use from gromacs 2020.4 in ubuntu 20.04. I installed networkx 2.3 and a newer version of python. In addition, numpy was installed.

 ![Screenshot from 2021-01-19 00-42-53](https://europe1.discourse-cdn.com/flex013/uploads/bioexcel/original/1X/1da0e6e99d68a768eb1a5ce16d4abac74af89b69.png)