I was giving the command gmx mdrun -v -deffnm em while doing the energy minimization step but i encountered the error .

Fatal error:

There is no domain decomposition for 8 ranks that is compatible with the given

box and a minimum cell size of 8.09853 nm

Change the number of ranks or mdrun option -rdd or -dds

Look in the log file for details on the domain decomposition

For more information and tips for troubleshooting, please check the GROMACS

website at http://www.gromacs.org/Documentation/Errors

how to rectify this and what does this mean .......please help me out.

I am attaching the files below.

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