# Gmx trjconv

**URL:** <https://gromacs.bioexcel.eu/t/gmx-trjconv/5824>\
**Category:** User discussions\
**Tags:** mdp-parameters, mdrun, gmx-trjconv, gmx-distance\
**Created:** [February 17, 2023, 10:20am UTC](https://gromacs.bioexcel.eu/t/gmx-trjconv/5824 "2023-02-17T10:20:28Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![kalpanap5](https://avatars.discourse-cdn.com/v4/letter/k/4bbf92/32.png) [@kalpanap5](https://gromacs.bioexcel.eu/u/kalpanap5)\
**Post date:** [February 17, 2023, 10:20am UTC](https://gromacs.bioexcel.eu/t/gmx-trjconv/5824/1 "2023-02-17T10:20:28Z")

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GROMACS version:2020.1  
GROMACS modification: No  
Here post your question

![error google forum](https://europe1.discourse-cdn.com/flex017/uploads/bioexcel1/original/2X/8/8b46836fb61cc6789265d847c379650404e72826.jpeg)  
when, I tried convert trajectory of molecular dynamics simulation of my protien it shows,  
Fatal Error:  
Magic Number Error in XTC file (read 0,should be 1995)  
so,my first question is this a version problem?  
next question - how to solve it?  
and the protien is a side during simulation some times out of box?

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**Author:** ![alevilla](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/alevilla/32/439_2.png) [@alevilla](https://gromacs.bioexcel.eu/u/alevilla)\
**Post date:** [February 17, 2023, 3:21pm UTC](https://gromacs.bioexcel.eu/t/gmx-trjconv/5824/2 "2023-02-17T15:21:41Z")

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Hi,  
here you can post to similar questions and understand more on your error  
[https://gromacs.bioexcel.eu/search?q=magic%20number%20](https://gromacs.bioexcel.eu/search?q=magic%20number%20)  
One can get such a error when the xtc is corrupt (for example)  
Kind regards  
Alessandra