Command line:
gmx_mpi -merge -f XXX.gro heme.gro -o complex.gro
Error in user input:
Invalid command-line options
In command-line option -merge
Invalid value: heme.gro
In command-line option -merge
Invalid value: 33.gro
In command-line option -merge
Option specified multiple times
For more information and tips for troubleshooting, please check the GROMACS
website at https://manual.gromacs.org/current/user-guide/run-time-errors.html