# Segmentation fault running gmx mdrun to introduce a protein into a membrane **URL:** \ **Category:** User discussions\ **Created:** [November 26, 2020, 5:22pm UTC](https://gromacs.bioexcel.eu/t/segmentation-fault-running-gmx-mdrun-to-introduce-a-protein-into-a-membrane/1158 "2020-11-26T17:22:27Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![lorena](https://avatars.discourse-cdn.com/v4/letter/l/ce73a5/32.png) [@lorena](https://gromacs.bioexcel.eu/u/lorena)\ **Post date:** [November 26, 2020, 5:22pm UTC](https://gromacs.bioexcel.eu/t/segmentation-fault-running-gmx-mdrun-to-introduce-a-protein-into-a-membrane/1158/1 "2020-11-26T17:22:27Z")
GROMACS version: 2019.3 GROMACS modification: No Hello Gromacs users I’m trying to introduce a protein into a membrane using the tutorial of g\_membed but when I try to run this command gmx mdrun -membed membed.dat -s membed.tpr -mn index.ndx -v -c confout.pdb I obtain a segmentation fault error and I do not know what this means and how can I solve it The error is this one: starting mdrun ‘Martini system’ 1000 steps, 2.0 ps. step 0Segmentation fault Does someone know what can I do? Thank you in advanced. ---
**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:** [November 27, 2020, 8:34am UTC](https://gromacs.bioexcel.eu/t/segmentation-fault-running-gmx-mdrun-to-introduce-a-protein-into-a-membrane/1158/2 "2020-11-27T08:34:21Z")
Hi, see a previous discussion on the same topic > [@"Energy group exclusions" are supported or not? error during mdrun -membed](https://gromacs.bioexcel.eu/t/energy-group-exclusions-are-supported-or-not-error-during-mdrun-membed/640): > > GROMACS version: 2020.3 GROMACS modification: No Here post your question Hello, everyone, i am new to gromacs, i just try to insert a membrane protein into dppc bilayer by using mdrun -membed command. During creating the file .tpr by using grompp command: gmx grompp -c prot+dppc+sol\_solvdel.gro -p system.top -f g\_membed.mdp -n index.ndx -o membed.tpr -maxwarn 2 i got this information: ERROR 1 [file g\_membed.mdp]: Energy group exclusions are currently not supported so i deleted the c… Best regards Alessandra