# BAR analysis error **URL:** \ **Category:** User discussions\ **Created:** [October 24, 2023, 5:17pm UTC](https://gromacs.bioexcel.eu/t/bar-analysis-error/7462 "2023-10-24T17:17:10Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![pinoji1](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/pinoji1/32/1442_2.png) [@pinoji1](https://gromacs.bioexcel.eu/u/pinoji1)\ **Post date:** [October 24, 2023, 5:17pm UTC](https://gromacs.bioexcel.eu/t/bar-analysis-error/7462/1 "2023-10-24T17:17:10Z")
Continuing the discussion from ["Assertion failed" error when running the BAR command](https://gromacs.bioexcel.eu/t/assertion-failed-error-when-running-the-bar-command/2485): I have the same issue. I post the md\*.file I created using the [Free Energy Calculations](http://www.mdtutorials.com/gmx/free_energy/07_analysis.html) The output md\* files are posted on this site. [Just output files](https://github.com/pinoji/GROMACS) I have newly installed Ubuntu & 2023.3 GROMACS. It still gives me the same error. Thank you very much. ---
**Author:** ![MagnusL](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/magnusl/32/2380_2.png) [@MagnusL](https://gromacs.bioexcel.eu/u/MagnusL)\ **Post date:** [October 25, 2023, 12:02pm UTC](https://gromacs.bioexcel.eu/t/bar-analysis-error/7462/2 "2023-10-25T12:02:24Z")
That sounds strange. I tested your files and `gmx bar -f md*.xvg` ran fine, admittedly using the current main development branch of Gromacs, but I don’t see why 2023.3 would be different in this case. What’s the exact command you used to run `gmx bar`? Does a normal simulation run with that Gromacs installation? Does other analysis tools work? ---
**Author:** ![pinoji1](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/pinoji1/32/1442_2.png) [@pinoji1](https://gromacs.bioexcel.eu/u/pinoji1)\ **Post date:** [October 25, 2023, 11:15pm UTC](https://gromacs.bioexcel.eu/t/bar-analysis-error/7462/3 "2023-10-25T23:15:59Z")
I used exactly what the tutorial suggested. gmx bar -f md\*.xvg -o -oi On the previous version (I reinstall Linux so I lost the previous working version) I created xvg files and analysis worked okay at that time. I had those xvg files in the backup disk so I tried to analyze the old data using new version of GROMACS. However, new version gave me the same error (same as Tutorial). I will try to uninstall and reinstall the GROMACS again. I will post the question again if I see the same issue. Thank you very much for your help. Executable: /usr/local/bin/gmx Data prefix: /usr/local Working dir: /home/Me/Desktop/0repeat/1st/Prod Command line: gmx bar -b 30 -f dhdl0.xvg dhdl10.xvg dhdl11.xvg dhdl12.xvg dhdl13.xvg dhdl14.xvg dhdl15.xvg dhdl16.xvg dhdl17.xvg dhdl18.xvg dhdl19.xvg dhdl1.xvg dhdl20.xvg dhdl2.xvg dhdl3.xvg dhdl4.xvg dhdl5.xvg dhdl6.xvg dhdl7.xvg dhdl8.xvg dhdl9.xvg -o -oi dhdl0.xvg: Ignoring set ‘pV (kJ/mol)’. * * * Program: gmx bar, version 2023.3 Source file: src/gromacs/gmxana/gmx\_bar.cpp (line 743) Function: sample\_coll\_insert\_sample(sample\_coll\_t\*, samples\_t\*, sample\_range\_t\*)::\ Assertion failed: Condition: sc-\>next-\>s Next not properly initialized! ## For more information and tips for troubleshooting, please check the GROMACS website at [Common Errors — GROMACS webpage https://www.gromacs.org documentation](http://www.gromacs.org/Documentation/Errors) ---
**Author:** ![MagnusL](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/magnusl/32/2380_2.png) [@MagnusL](https://gromacs.bioexcel.eu/u/MagnusL)\ **Post date:** [October 26, 2023, 6:35am UTC](https://gromacs.bioexcel.eu/t/bar-analysis-error/7462/4 "2023-10-26T06:35:15Z")
If you run into the same problem after the reinstallation of GROMACS it would be interesting to see if the test suite passes. I.e., if it works when you run `make check` where you built your GROMACS installation. ---
**Author:** ![pinoji1](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/pinoji1/32/1442_2.png) [@pinoji1](https://gromacs.bioexcel.eu/u/pinoji1)\ **Post date:** [October 26, 2023, 7:47pm UTC](https://gromacs.bioexcel.eu/t/bar-analysis-error/7462/5 "2023-10-26T19:47:55Z")
> [@pinoji1](#): > > gmx bar -f md\*.xvg -o -oi During the previous installation, I missed the error message “Could NOT find Sphinx (missing: SPHINX\_EXECUTABLE pygments) (Required is at least version “4.0.0”)” After installing “python3-sphinx”, and installing from home directly, it worked out. Thank you very much for the help. Now, it does BAR analysis.