This error can arise when the multiple timestep option is used. It is
essential that the primary cutoff (rprim) is less than the real
space cutoff (rcut) by at least the Verlet shell
width delr (preferably much larger!). DL_POLY_2 terminates
the run if this condition is not satisfied.
Action:
Adjust rcut, rprim and delr to satisfy the
DL_POLY_2 requirement. These are defined with the directives cut, prim and delr respectively.