DL_POLY_2 has detected an unacceptable degree of inaccuracy in the screening
function near the radius of cutoff in real space, which implies
the Hautman-Klein Ewald method will not be sufficiently accurate.
Action:
The user should respecify the HK control parameters given in the
CONTROL file. Either the convergence parameter should be increased or
the sum expanded to incorporate more images of the central
cell. (Warning: increasing the convergence parameter may cause failure in
the reciprocal space domain.) (See 4.1.1).