Gmx hbond - can't obtain X PixMap compatible matrix file

GROMACS version: 2018.4
GROMACS modification: No
Here post your question

When I write: gmx hbond -f eq3_900_1000.xtc -s eq3.tpr -hbn eq3_dgdg_5001.ndx -r 0.325 -b 905000 -e 905000

I get this error.
Fatal error:
Won’t make more than 99 backups of hbnum.xvg for you.
The env.var. GMX_MAXBACKUP controls this maximum, -1 disables backups.

For more information and tips for troubleshooting, please check the GROMACS
website at Errors - Gromacs
I want to obtain existence matrix for all hydrogen bonds over all frames. I will work on this data later to check something, but I am not able to get this data. Could you help me?

gmx tools creates a back-up of the previous outputs everytime you run it in the same directory. These files are labelled as #…# and an increasing number (in your case #hbnum.xvg.1#). You hit the maximum of back-up file. You can systematically remove the files from the working directory or disable backups by setting environment variable

see Environment Variables — GROMACS 2020.4 documentation

Best regards

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