Got this error at the NVT step in MD simulations through gromacs 5.0
"16 particles communicated to PME rank 1 are more than 2/3rd times the cutt-off of the domain decomposition cell of their charge group in discussion y"
Your simulation crashed. Try Google; you'll find thousands of relevant posts in the gmx-users archive with suggestions, and this is an error message that even has a specific explanation on the GROMACS website.