# About fatal error/Umbrella Sampling

**URL:** <https://gromacs.bioexcel.eu/t/about-fatal-error-umbrella-sampling/2843>\
**Category:** User discussions\
**Created:** [September 20, 2021, 3:18pm UTC](https://gromacs.bioexcel.eu/t/about-fatal-error-umbrella-sampling/2843 "2021-09-20T15:18:07Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![konstantina](https://avatars.discourse-cdn.com/v4/letter/k/278dde/32.png) [@konstantina](https://gromacs.bioexcel.eu/u/konstantina)\
**Post date:** [September 20, 2021, 3:18pm UTC](https://gromacs.bioexcel.eu/t/about-fatal-error-umbrella-sampling/2843/1 "2021-09-20T15:18:07Z")

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GROMACS version:  
GROMACS modification: Yes/No  
Here post your question  
Ignoring obsolete mdp entry ‘title’ Ignoring obsolete mdp entry ‘optimize\_fft’  
What modifications should I make in the mdp files in order to not get these warnings?

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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:** [September 20, 2021, 5:27pm UTC](https://gromacs.bioexcel.eu/t/about-fatal-error-umbrella-sampling/2843/2 "2021-09-20T17:27:06Z")

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Remove obsolete keywords from your `.mdp` file. But these are not fatal errors, they are merely advisory notes and they will not halt `grompp`.