# No default Bond types, U-B types

**URL:** <https://gromacs.bioexcel.eu/t/no-default-bond-types-u-b-types/9404>\
**Category:** User discussions\
**Tags:** grompp, gmx-grompp\
**Created:** [June 15, 2024, 6:01pm UTC](https://gromacs.bioexcel.eu/t/no-default-bond-types-u-b-types/9404 "2024-06-15T18:01:24Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Fayaz](https://avatars.discourse-cdn.com/v4/letter/f/22d042/32.png) [@Fayaz](https://gromacs.bioexcel.eu/u/Fayaz)\
**Post date:** [June 15, 2024, 6:01pm UTC](https://gromacs.bioexcel.eu/t/no-default-bond-types-u-b-types/9404/1 "2024-06-15T18:01:24Z")

</div>

![gr](https://europe1.discourse-cdn.com/flex017/uploads/bioexcel1/original/2X/f/f8e76ab2624d1c421feb0ce131910a5492a89d61.png)  
Hello,  
I have attached a picture of errors. Can anyone guide how to fix this problem?