# Regarding the topology is not created in the ATB server. how to overcome this issue?

**URL:** <https://gromacs.bioexcel.eu/t/regarding-the-topology-is-not-created-in-the-atb-server-how-to-overcome-this-issue/7766>\
**Category:** User discussions\
**Tags:** forcefield, mdp-parameters, mdrun, topology\
**Created:** [December 1, 2023, 9:14am UTC](https://gromacs.bioexcel.eu/t/regarding-the-topology-is-not-created-in-the-atb-server-how-to-overcome-this-issue/7766 "2023-12-01T09:14:06Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Akhilesh97](https://avatars.discourse-cdn.com/v4/letter/a/a4c791/32.png) [@Akhilesh97](https://gromacs.bioexcel.eu/u/Akhilesh97)\
**Post date:** [December 1, 2023, 9:14am UTC](https://gromacs.bioexcel.eu/t/regarding-the-topology-is-not-created-in-the-atb-server-how-to-overcome-this-issue/7766/1 "2023-12-01T09:14:06Z")

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GROMACS version:  
GROMACS modification: No  
Here post your question  
This error is encountered after submitting my structure comprises of Si, B and N based sheet to the ATB server and it shows the error like this **" Unsupported angle value encountered: 27.32deg (B3-Si12-H22). This often indicates there is an error in the submitted structure."**  
How to resolve this issue?