A minimum DD cell size of 6.75 nm indicates that either you are using some long distance restraints (in which case you need fewer DD cells or you cannot run in parallel) or there is something terribly wrong with the topology. The DD cell size is based on bonded interaction distances, cutoffs, and a few other factors.
The error shouldn't depend on the force field. Something else has gone wrong, but without a complete list of your exact commands and the .log file itself from the failing run, it's impossible to guess at what the issue is. Any other warnings or errors from GROMACS tools would be helpful to know about.
I have a question about this error. my system contains graphene and surfactants. In last box I put graphene in the middle of my box and the graphene was npbc and the mdrun went well, then I put a pbc graphene and the x and y dimension box fixed to match the size of graphene sheet. but in energy minimization step. I get this error! Can I put the x, y dimension of my box larger than pbc graphene?