# Lig .itp error

**URL:** <https://gromacs.bioexcel.eu/t/lig-itp-error/7965>\
**Category:** User discussions\
**Created:** [January 3, 2024, 12:08pm UTC](https://gromacs.bioexcel.eu/t/lig-itp-error/7965 "2024-01-03T12:08:42Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![NMDr](https://avatars.discourse-cdn.com/v4/letter/n/dec6dc/32.png) [@NMDr](https://gromacs.bioexcel.eu/u/NMDr)\
**Post date:** [January 3, 2024, 12:08pm UTC](https://gromacs.bioexcel.eu/t/lig-itp-error/7965/1 "2024-01-03T12:08:42Z")

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GROMACS version: 2019  
GROMACS modification: Yes/No  
ERROR 1 [file lig.itp, line 363]:  
No default Proper Dih. types  
I am using Charmm36-mar 2019 ff for protein ligand complex, cgenff server used to generate the ligand topology. while generate ions.tpr i got the following error. how to solve this

ERROR 2 [file lig.itp, line 370]:  
No default Proper Dih. types

ERROR 3 [file lig.itp, line 390]:  
No default Proper Dih. types

ERROR 4 [file lig.itp, line 414]:  
No default Proper Dih. types

ERROR 5 [file lig.itp, line 494]:  
No default Proper Dih. types

Excluding 3 bonded neighbours molecule type ‘Protein\_chain\_P’  
Excluding 3 bonded neighbours molecule type ‘lig’  
Excluding 2 bonded neighbours molecule type ‘SOL’

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<div class="post-metadata">

**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 3, 2024, 1:48pm UTC](https://gromacs.bioexcel.eu/t/lig-itp-error/7965/2 "2024-01-03T13:48:40Z")

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Please do not use the March 2019 version of the force field port; it is out of sync with the current CGenFF server. Use the July 2022 version of the port, and if you are provided with an auxiliary `.prm` file, it contains parameters you need to `#include` in the system topology.